Yes, we are "saved" by Christ's death on the cross. But people accepting this and running around saying they are "saved" just doesn't cut it. Well-meaning people can slip off the True Way and endanger their souls by sinning, and are you telling me they can't end up in hell? Of course they can. So what happened to all those declarations about being "saved"? Being "saved", then, is a life-long endeavor to stay on the True Way, which is why it is said that "faith without works is dead." It takes more than just faith that you are saved.
You have misinterpreted the role of Holy Communion in many Denominations. It is simply a reminder that we are again accepting of what Christ did for us (since the day that we were "saved") and that those sins committed since being "saved" are also forgiven, BUT ONLY IF WE ASK FOR FORGIVENESS. And that is what we do at Holy Communion.
#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.