That"s what Satan or Luther will tell you. It''s shame that some people, to this day, listen to those two evil souls.
Jesus died on the cross for your murder or two or a bit of nookie with the neighbor’s wife. His eternal and perfect sacrifice is greater than any sin. Otherwise, you do “count the blood of the covenant an unholy thing and do despite to the spirit of grace”.
God through Jesus is a justifier of the ungodly. Rom 3:26.