Each tree is recognized by its own fruit. People do not pick figs from thorn bushes, or grapes from briers.
A good man brings good things out of the good stored up in his heart, and an evil man brings evil things out of the evil stored up in his heart. For the mouth speaks what the heart is full of."
The proof of Christianity is not perfection. Evidence of salvation is when your faith continually leads you toward repentance, and Jesus continually brings about chance. A Christians ongoing response to the gospel is a steady stream of repentance. If apples on a limb identify an apple tree, so repentance is a fruit that reveals the inner essence of a person who trusts in Jesus Christ.
How do you know if you've trusted Christ for salvation?
Some people think they are Christians because they celebrate Christmas, they may attend church on Easter and they don't practice any other religion. WOW - that just explained my childhood. Living a pretty good life and being a good moral person was causes for us to be a Christian. What we didn't realize is that we must have a personal relationship with Christ; and we did not have that at all.
When we are not saved, we experience worldly grief. That is grief that leads to death; we will continue to go back to it over and over again without repentance. But when we get saved, we experience Godly grief - a grief that lets us know that we sinned against a Holy God and that leads to repentance that leads to salvation. Godly grief has an element of shame. The shame we feel under the weight of God's holiness is not a type of shame that leads us back into sin, but rather a type of shame that leads us out. Praise The Lord!
The truth is, we are all born sinful, no one is perfect; except Jesus. So in order to be saved, we must experience Godly sorrow, repent of our sins, accept Jesus into our hearts and leave the life of sin. Until we are saved, we are visually blind to sin until God opens our eyes. We don't even realize how dark we were living and the sinful live we were leading until that sweet day of surrender happens to us.
After we are saved we are called to bear good fruit for evidence of salvation. A healthy tree cannot bear bad fruit, only good. If you are saved and do not bear fruit, your branch will be cut off the tree of life. A person can attend church, sing the songs, read their bible, pray, etc. But if you are not producing fruit (witness to others, personal relationship with God, forgive others, being fishers of men, love, peace, faithfulness, joy, goodness, gentleness, patience, self-control, kindness, etc) then you are not producing good fruit.
As you pray, ask God to reveal to you the fruit of your faith (or lack thereof). This request takes surrender and humility. Ask, "Have I put my faith completely in you?" And listen for His reply.