There is far more to repentance and redemption than simply saying that you believe in the Savior. You must be truly sorry for what you have done and must also stop the sinful behavior(s) (often the hardest for many of us), and you must make restitution to anyone you may have harmed if it is possible to do so, or make restitution in some way to society as a whole. You must also strive to never commit the sin again for which you are seeking forgiveness. Claiming a belief in Christ as our savior and accepting him into your life is only the first step, not the entire process. The process lasts a lifetime.

Some sins are unforgivable, but which ones and under which circumstances is ultimately not for us to decide. The right to pass final judgment belongs only to God and his Son who suffered for us so that we would have the possibility of redemption. That doesn't mean we can't use a little common sense to figure out which sins will likely put us on the wrong side of that unforgivable line.