Do you sometimes think more highly of your so-called "Christian behaviour" than you ought to?
Romans 4, 1 -5, might set you right!
Abraham was, humanly speaking, the founder of our Jewish nation. What did he discover about being made right with God? If his good deeds had made him acceptable to God, he would have had something to boast about. But that was not God's way. For the Scriptures tell us, "Abraham believed God, and God counted him as righteous because of his faith." When people work, their wages are not a gift, but something they have earned. But people are counted as righteous, not because of their work, but because of their faith in God who forgives sinners.
Will you stop boasting about the things you do as a believer, and remember that you are saved by God's goodness - and not your own?