Is the sinner's Prayer a Passport to heaven?

The problem is, we have been taught that we get a passport to heaven the moment we say the Sinner's Prayer, and then we talk about life transformation or sanctification later. However, Justification by faith is meant for those who wants to follow God but unable to do so perfectly.

So in the first place, a Christian is a sinner who wants to follow God but is unable to do so and therefore needs a saviour... NOT a sinner who merely wants to escape hell and go to heaven.

The Sinner's prayer is an acceptance of Jesus as Lord and Savior. It is not an assurance of Salvation. Salvation is evidenced by true repentance from our former lives, and obedience to our new lives as believers.

3 Now by this we know that we know Him, if we keep His commandments. 4 He who says, “I know Him,” and does not keep His commandments, is a liar, and the truth is not in him. 5 But whoever keeps His word, truly the love of God is perfected in him. By this we know that we are in Him. 6 He who says he abides in Him ought himself also to walk just as He walked. 7 Brethren,[a] I write no new commandment to you, but an old commandment which you have had from the beginning. The old commandment is the word which you heard from the beginning.[b]8 Again, a new commandment I write to you, which thing is true in Him and in you, because the darkness is passing away, and the true light is already shining. 9 He who says he is in the light, and hates his brother, is in darkness until now. 10 He who loves his brother abides in the light, and there is no cause for stumbling in him. 11 But he who hates his brother is in darkness and walks in darkness, and does not know where he is going, because the darkness has blinded his eyes. - 1 John 2:3-11

4 Whoever commits sin also commits lawlessness, and sin is lawlessness. 5 And you know that He was manifested to take away our sins, and in Him there is no sin. 6 Whoever abides in Him does not sin. Whoever sins has neither seen Him nor known Him. 7 Little children, let no one deceive you. He who practices righteousness is righteous, just as He is righteous. 8 He who sins is of the devil, for the devil has sinned from the beginning. For this purpose the Son of God was manifested, that He might destroy the works of the devil. 9 Whoever has been born of God does not sin, for His seed remains in him; and he cannot sin, because he has been born of God. - 1 John 3:4-9

Whoever believes that Jesus is the Christ is born of God, and everyone who loves Him who begot also loves him who is begotten of Him. 2 By this we know that we love the children of God, when we love God and keep His commandments. 3 For this is the love of God, that we keep His commandments. And His commandments are not burdensome. 4 For whatever is born of God overcomes the world. And this is the victory that has overcome the world—our[a] faith. 5 Who is he who overcomes the world, but he who believes that Jesus is the Son of God? - 1 John 5:1-5

2 But we know that the judgment of God is according to truth against those who practice such things. 3 And do you think this, O man, you who judge those practicing such things, and doing the same, that you will escape the judgment of God? 4 Or do you despise the riches of His goodness, forbearance, and longsuffering, not knowing that the goodness of God leads you to repentance? 5 But in accordance with your hardness and your impenitent heart you are treasuring up for yourself wrath in the day of wrath and revelation of the righteous judgment of God, 6 who “will render to each one according to his deeds”:[a] 7 eternal life to those who by patient continuance in doing good seek for glory, honor, and immortality; 8 but to those who are self-seeking and do not obey the truth, but obey unrighteousness—indignation and wrath, 9 tribulation and anguish, on every soul of man who does evil, of the Jew first and also of the Greek; 10 but glory, honor, and peace to everyone who works what is good, to the Jew first and also to the Greek. 11 For there is no partiality with God. - Rom 2:2-11

We don't need to keep reminding people how to live for God. We need to remind people what Salvation means in the first place....