...but Jesus taught,

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...some in the bible boasted about their accomplishments as there are many verses on boasting.

What is it to boast?

... to praise oneself extravagantly in speech : speak of oneself with excessive pride

boasting about accomplishments.

...but Jesus taught in Matthew 6:1-4 NKJV

"Take heed that you do not do your charitable deeds before men, to be seen by them. Otherwise you have no reward from your Father in heaven. [2] Therefore, when you do a charitable deed, do not sound a trumpet before you as the hypocrites do in the synagogues and in the streets, that they may have glory from men. Assuredly, I say to you, they have their reward. [3] But when you do a charitable deed, do not let your left hand know what your right hand is doing, [4] that your charitable deed may be in secret; and your Father who sees in secret will Himself reward you openly.

Jeremiah 9:23 This is what the LORD says: “Don’t let the wise boast in their wisdom, or the powerful boast in their power, or the rich boast in their riches.”

James 4:16-17 As it is, you boast in your arrogant schemes. All such boasting is evil. If anyone, then, knows the good they ought to do and doesn’t do it, it is sin for them.

Jude 1:16 These people are grumblers and faultfinders; they follow their own evil desires; they boast about themselves and flatter others for their own advantage.

2 Peter 2:18-19 For they mouth empty, boastful words and, by appealing to the lustful desires of the flesh, they entice people who are just escaping from those who live in error. They promise them freedom, while they themselves are slaves of depravity–for “people are slaves to whatever has mastered them.”

...Truly the signs of an apostle were accomplished among you with all perseverance, in signs and wonders and mighty deeds.

Signs and Wonders are not proof someone is a true follower of God:

...but JESUS taught, Matthew 7:22-23 NKJV

Many will say to Me in that day, ‘Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?’ [23] And then I will declare to them, ‘I never knew you; depart from Me, you who practice lawlessness!’

...but Jesus taught, Matthew 24:11 NKJV

Then many false prophets will rise up and deceive many.

Matthew 24:23-25 NKJV

“Then if anyone says to you, ‘Look, here is the Christ!’ or ‘There!’ do not believe it. [24] For false christs and false prophets will rise and show great signs and wonders to deceive, if possible, even the elect. [25] See, I have told you beforehand.

Matthew 24:26-27 NKJV

“Therefore if they say to you, ‘Look, He is in the desert!’ do not go out; or ‘Look, He is in the inner rooms!’ do not believe it. [27] For as the lightning comes from the east and flashes to the west, so also will the coming of the Son of Man be.

Matthew 24:4-5 NKJV

And Jesus answered and said to them: “Take heed that no one deceives you. [5] For many will come in My name, saying, ‘I am the Christ,’ and will deceive many.

...that when you receive Jesus you must attend a church to worship God and join a congregation or denomination.

...but Jesus taught, John 4:7,18-24 NKJV

[19] The woman said to Him, “Sir, I perceive that You are a prophet. [20] Our fathers worshiped on this mountain, and you Jews say that in Jerusalem is the place where one ought to worship.” 

[21] Jesus said to her, “Woman, believe Me, the hour is coming when you will neither on this mountain, nor in Jerusalem, worship the Father. 

[22] You worship what you do not know; we know what we worship, for salvation is of the Jews. [23] But the hour is coming, and now is, when the true worshipers will worship the Father in spirit and truth; for the Father is seeking such to worship Him. [24] God is Spirit, and those who worship Him must worship in spirit and truth.”

John 6:63 

It is the Spirit who gives life; the flesh profits nothing. The words that I speak to you are spirit, and they are life.

John 14:5-6 

Thomas said to Him, “Lord, we do not know where You are going, and how can we know the way?” [6] Jesus said to him, “I am the way, the truth, and the life. No one comes to the Father except through Me.

the law was nailed to the cross, and we are no longer bound to the law.

...but Jesus taught, Matthew 5:17-18 NKJV

“Do not think that I came to destroy the Law or the Prophets. I did not come to destroy but to fulfill. [18] For assuredly, I say to you, till heaven and earth pass away, one jot or one tittle will by no means pass from the law till all is fulfilled.

...and Jesus taught, Matthew 5:19 NKJV

Whoever therefore breaks one of the least of these commandments, and teaches men so, shall be called least in the kingdom of heaven; but whoever does and teaches them, he shall be called great in the kingdom of heaven.

...and Jesus taught, Matthew 19:17b NKJV

But if you want to enter into life, keep the commandments.”

...but Jesus taught, 

The one who relies upon God's election to salvation and does not repent goes home unjustified. (Parable of the Publican and the Pharisee. Luke 18:10-14.)

To have eternal life, follow the Ten Commandments, deny yourself and follow Jesus. If you deny yourself, take up your cross, and "follow Me," you "shall have eternal life." (Matthew 19:27-29; Matthew 10:37-39; John 12:25-26.)

For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast.

...but Jesus taught, Matthew 16:27 NKJV

For the Son of Man will come in the glory of His Father with His angels, and then He will reward each according to his works.

...but Jesus taught, Revelation 2:5 NKJV

Remember therefore from where you have fallen; repent and do the first works, or else I will come to you quickly and remove your lampstand from its place—unless you repent.

...but Jesus taught, Revelation 2:19 NKJV

“I know your works, love, service, faith, and your patience; and as for your works, the last are more than the first.

...and James also taught, James 2:20 NKJV

But do you want to know, O foolish man, that faith without works is dead?

To have eternal life, follow the Ten Commandments, deny yourself (i.e., repent and do works worthy of repentance) and then follow Jesus, deny yourself, take up your cross, and "follow Me," you "shall have eternal life." (Matthew 19:27-29; Matthew 10:37-39; John 12:25-26.)

..."I desire therefore that the men pray everywhere, lifting up holy hands, without wrath and doubting"

...but Jesus taught, Matthew 6:5-7 NKJV

“And when you pray, you shall not be like the hypocrites. For they love to pray standing in the synagogues and on the corners of the streets, that they may be seen by men. Assuredly, I say to you, they have their reward. [6] But you, when you pray, go into your room, and when you have shut your door, pray to your Father who is in the secret place; 

and your Father who sees in secret will reward you openly. [7] And when you pray, do not use vain repetitions as the heathen do. For they think that they will be heard for their many words.

Matthew 6:8-13 NKJV

“Therefore do not be like them. For your Father knows the things you have need of before you ask Him. [9] In this manner, therefore, pray: Our Father in heaven, Hallowed be Your name. [10] Your kingdom come. Your will be done On earth as it is in heaven. [11] Give us this day our daily bread. [12] And forgive us our debts, As we forgive our debtors. [13] And do not lead us into temptation, But deliver us from the evil one. For Yours is the kingdom and the power and the glory forever. Amen.

that every human enters life condemned (to hell) due to the sin of Adam. This is called "Original Sin".

...but Jesus taught, and implied children were innocent, and encouraged us to become like children, or otherwise “you will never enter the kingdom of heaven.” 

Matthew 18:2-5 NKJV

Then Jesus called a little child to Him, set him in the midst of them, [3] and said, “Assuredly, I say to you, unless you are converted and become as little children, you will by no means enter the kingdom of heaven. [4] Therefore whoever humbles himself as this little child is the greatest in the kingdom of heaven. [5] Whoever receives one little child like this in My name receives Me.

...and Moses wrote, Deuteronomy 1:39 NKJV

‘Moreover your little ones and your children, who you say will be victims, who today have no knowledge of good and evil, they shall go in there; to them I will give it, and they shall possess it.

...and Moses wrote, Deuteronomy 24:16 NKJV

“Fathers shall not be put to death for their children, nor shall children be put to death for their fathers; a person shall be put to death for his own sin.

...and Ezekiel wrote, Ezekiel 18:20 NKJV

The soul who sins shall die. The son shall not bear the guilt of the father, nor the father bear the guilt of the son. The righteousness of the righteous shall be upon himself, and the wickedness of the wicked shall be upon himself.

...if you declare with your mouth, "Jesus is Lord," and believe in your heart that God raised him from the dead, you will be saved.

...but Jesus taught, Matthew 7:22-23 NKJV

Many will say to Me in that day, ‘Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?’ [23] And then I will declare to them, ‘I never knew you; depart from Me, you who practice lawlessness!’

and Jesus taught, John 14:15 NKJV

“If you love Me, keep My commandments.

and Jesus taught, Matthew 16:24-25,27 NKJV

Then Jesus said to His disciples, “If anyone desires to come after Me, let him deny himself, and take up his cross, and follow Me. [25] For whoever desires to save his life will lose it, but whoever loses his life for My sake will find it. [27] For the Son of Man will come in the glory of His Father with His angels, and then He will reward each according to his works.

...but Jesus taught, John 10:17-18 NKJV

“Therefore My Father loves Me, because I lay down My life that I may take it again. [18] No one takes it from Me, but I lay it down of Myself. I have power to lay it down, and I have power to take it again. This command I have received from My Father.”

“You have heard that it was said, ‘You shall love your neighbor and hate your enemy.’

...but Jesus taught, Matthew 5:44-48 NKJV

But I say to you, love your enemies, bless those who curse you, do good to those who hate you, and pray for those who spitefully use you and persecute you, [45] that you may be sons of your Father in heaven; for He makes His sun rise on the evil and on the good, and sends rain on the just and on the unjust. [46] For if you love those who love you, what reward have you? Do not even the tax collectors do the same? [47] And if you greet your brethren only, what do you do more than others? Do not even the tax collectors do so? [48] Therefore you shall be perfect, just as your Father in heaven is perfect.

an eye for an eye, and a tooth for a tooth.

...but Jesus taught, Matthew 5:39-42 NKJV

But I tell you not to resist an evil person. But whoever slaps you on your right cheek, turn the other to him also. [40] If anyone wants to sue you and take away your tunic, let him have your cloak also. [41] And whoever compels you to go one mile, go with him two. [42] Give to him who asks you, and from him who wants to borrow from you do not turn away.