I don't think its just atheists....
Unbelievers are all on the broad road that leads unto destruction, after all. I think "tolerant+liberal" people are more openly hostile to Jesus, but other people are, too. Muslims. New Age people. Some feminists. Marxists. Some conservatives, even (BTW--there are lots of gay conservatives. They vote conservative because gay men have more money that most of us and the conservatives protect their interests).
So...yeah...and then, lots of people like watered-down Christianity of some sort. Around here (Bible Belt), we like mega churches and conventional Christianity. Like, you drive a big truck, you're a decent dude, go to church, you're a Christian! Not that there's anything wrong with that, BUT...
...not all Christians (even where I live) drive big trucks and vote GOP. See what I'm saying? I'm guilty of the left wing version of that, sometimes. I think people are "less Christian" when they talk GOP stuff. So I'm no different, but...
...it seems like de-clawed, watered down Christianity (conservative or progressive/liberal/whatever) can be good, but Jesus--that guy who can change people from the inside out and forgives ALL your sins--not terribly popular.
Ramble ramble..its not just atheists. You are for me or you are against me, and most people are against Him to some extent.