Your logic is convoluted at best. You commit no sin that is unforgivable. It is unforgivable if you believe that your sin is so great that not even God can forgive it. This goes back to pride. If you are truly sorry for your sins and receive Baptism, than original sin and all actual sin is forgiven. If you do not believe you can be forgiven, the original sin is removed by baptism, but this actual sin would be still with you, i.e., recommitted if you would in the belief you cannot be forgiven. Stated simply, no sin is so great that it causes God to stop loving you and wanting to forgive you… Forgiveness is always there. Your job is to accept that forgiveness and trust in God’s mercy.
Deacon Ed B