#1407 This is forever debated as to whether our sins are forgiven past, present, and future. Was the work finished on the cross? Not that this gives us licence to sin; however, our gratitude will lead us to good works.
Let me ask, after you are saved--is the confessing to acknowledges you acted against God and then repenting to turn away from sin and toward God? Is this what you are referring to in light of Holy Communion where we must come clean beofre God? This is much different than having to continually ask forgivenness to ensure we are still able to go to heaven.
I know this gets a lot more complicated than Jesus intended it to be.
I think there are sins that one could commit even after being "saved", and I think those sins could probably keep us from heaven.
I also think that Holy Communion should be a frequently-offered opportunity to ask for forgiveness, and (hopefully, if we really mean it) to make sure that we are not separated from God should we die at that moment.
Of course, Holy Communion is not the only opportunity for that. But it surely was instituted by Christ himself, and surely seems like the time for one's soul to acknowledge what Christ did for us.