What tenets or beliefs of Christianity do you find the most distasteful or difficult to accept?

I'm not a Christian anymore but when I was the idea of a Hell seemed impossible since our God was so loving and forgiving. Also I hated confession as a child and once asked a priest why I had to confess things I'd already been forgiven for (as Christ's sacrifice on the cross emptied hell and forgave all our sins, past, present and future). The priest was astonished, to say the least.