When all is said and done and everything has been reasoned out, it all comes down to practicality. I just can't find it in my heart to hate other people enough to be a proper Christian.
Sure, I could be a woolly liberal, go to church and enjoy the music, but to be a true Christian requires a level of dislike for others that I would struggle to maintain. Anyone seeking evidence for this just has to look at how the online Christian community interacts with the unconvinced majority.