Paul's Epistles are a classic example of doctrines rooted in a particular culture, which unfortunately is quite far removed from our own. Views in the Bible (OT and NT) on, say, women and their status, gay people, slavery, beating children, divorce, disease and disability being a punishment from God and many other ideas are just not relevant or acceptable nowadays. This whole Atonement thing is, to me, like that. Sacrifice for washing away 'Sin', which apparently we automatically inherited from Adam, is not easy to accept. In fact, I just don't! Also, I find the whole concept of eating and drinking Christ's 'flesh and blood' weird and distasteful. None of it gels with the mindset of modern people.