When Jesus died on the cross for our sins, he died for all our sins, past, present and future. We still have sin in our hearts, and when we sin God does not turn away from us, we turn away from Him. Because we believe that Jesus died for our sins we can repent and God is merciful and forgives our sins. To say ' I do not sin' is a lie, we all sin, ut only christians have the answer to our sins.