I am a Christian (or at least trying to be) and don't see anything in Buddhism which is antithetical to Christianity unlike Islam for example. But some might claim statues of the Buddha are idols though Buddhists don't consider him to be a God. However, I am not a rigid sectarian either.
It appears to me that a Buddhist "sin" would be considered a sin in Christ's teachings as well. Many Christians would consider the doctrine of reincarnation to be antithetical to Christianity. I don't.
Actually, I agree with you. It's not that Buddhism is incompatible with Christianity per se, it's that few Christian denominations will agree. (Unitarian is all that I can think of)