I accept that some believe this is all religion is about. They cannot understand the usual situation which is this life has thrown us some curves we cannot wait for the next life to resolve. We need help now.
Original Sin is merely mankind's propensity to turn away from doing what is ideal to something that is "good enough" or simply wrong. Those of us who wish to follow the way of the spirit, not just the ways of mind and body delve into the ways of God, or the ideal way.
If my experience was that all religion had to offer was hope once I die, I would have tossed it aside like you. Instead, it opened up ways to live that have brought, joy, happiness, and blessings.
My advice, as always, is to seek and find God. Then, with lots of study, we can gain a better and clearer understanding of those who, in ancient times, wrote of their own experiences of God--all of which have very little to do with the afterlife. It has more to do with our present lives.