Religion does not make us sinless.
But a true, abiding relationship with Christ should make us sin less.

Afterward Jesus found him in the temple, and said to him, “Behold, you are made well. Sin no more, so that nothing worse happens to you.”
John 5:14, WEB

Jesus, standing up, saw her and said, “Woman, where are your accusers? Did no one condemn you?” She said, “No one, Lord.” Jesus said, “Neither do I condemn you. Go your way. From now on, sin no more.”
John 8:10-11, WEB