You might be confusing all atheists with New Atheism. And Evolutionists as atheists.
Similar to the logic that cats are actually dogs. Each are mammals, carnivores, have tails, are domesticated pets and carry fleas. So, must be the same!!?
Sydney Bloods is on the money: atheists don't believe in deities. Strict definition. That's it!!
Some may choose to believe in the Big Bang, some may believe religion is the root of all evil, some have leftist leanings and some to the right. Some are racist, bigots or philanthropic or rationalists. Up to the individual, I guess. Most Christians I know accept evolution and reconcile it with their beliefs.
There is also confusion between the terms belief and religion. I'll save that for another time.
I have a problem with New Atheists because their primary belief is that "religion should not simply be tolerated but should be countered, criticized, and exposed by rational argument wherever its influence arises." That tends to make them anti-religion rather than atheist, but they have now redefined the general term atheist within those narrow parameters. I don't identify with them at all and resent their intrusion. I am an atheist, but not anti religion. I have a range of other beliefs, but detest bigots and fundamentalists. New Atheists are both by virtue of their mantra.
So are some Christians.
Hmmmm! Does this also mean that Christians are actually atheists?
That rise, sadly is due to the relationship between believers and non believers in political realm's. It occurs due to people who simply didn't have a deity being treated as a group in the late 80's through to most of the 90's, now whether that was through ignorance or simply practicality of politics we're still stuck with it today.
as always it is the views of those that talk the loudest which ends up as identifying traits of the group, even if that group doesn't actually exist. and its always inevitable that those with the deepest held beliefs will be the ones speaking loudly.
It's why I as someone who is anti-religious hates being asked are you an "atheist" or addressed as "oh you're an atheist." because vast majority of the time i'm not being addressed as definition of the term not believing in a god. I'm being addressed as belonging to a "group" with a whole magnitude of beliefs which i simply don't subscribe to.
I very much despise this notion of an atheist "community" which is gaining momentum. I understand the reasons for it, i even see that in some places like the USA for example it is required due to the invasive nature religion plays in politics over there, but i just cannot support it.