It's a little more complicated than that when you remember that there's actually a world outside the US. A lot of the reactionary elements here in Europe for instance aren't really explicitly christian beyond a sort of vague "cultural christianity" that can mean a million different things depending on who you ask (and it's usually just something like baptizing your kids or getting married in a church because it's family tradition). The worst islamophobes, racists, misogynists, anti-lgbtq fucks, zionists, and just general bigots I've interacted with IRL or in predominantly European language internet spaces have pretty much all been atheists, and none of those people support the right wing politicians/parties they do for any religious reasons.

The sort of evangelical freaks you have to deal with over there just aren't much of a factor over here.

Now, you could of course make the argument that some of this shit is inspired by (or even directly "imported" from) the US and has its roots in US evangelicalism, and I'd agree with that to some degree, but the point is that religion isn't a prerequisite for these things to take hold.