If I believe in Jesus and am saved why should I live differently?

I grew up in church, I knew about Jesus my whole life, how do I know if my faith is real?

Why do Christians single out homosexuality as a sin? Why is it a sin?

These questions and more seemed to relate to sin, morality, and true life change. Why does any of this matter if I believe Jesus is my Savior?

I shared some thoughts below on why our lives should look different when we are professing Christians and what marks a true believer.