With Christianity, your sins are forgiven, the slate is wiped clean and your eternal life is guaranteed through nothing you did yourself, even though you don't deserve it. It's the best deal in the universe.
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OOOOOO-Rah! Ann nails it!
One additional point....a christian can keep this "circle of forgiveness" going "ad infinitum"...after all, God is "All forgiving" so all the christian has to do is just keep asking for forgiveness, and their "trip to heaven" is assured.
Of course, there is always the thorny problem of whether God is more "just" than "forgiving", or more "forgiving" than "just".
But it's only a problem for christians.