Technically, by definition, Atheism is a religion. I feel like many atheists don't even realize that they are very similar to people who belong to another religion. They are both just belief systems.
atheists can still be religious (because it simply means don't believe in god) while nihilists call all religion as pointless, and foolish. those are the major differences between the two.
I've never met an atheist that didn't ridicule people that believe in God...
I've never met an atheist that didn't ridicule people that believe in God...
Yes you have. You just didn't realize they were an atheist because they didn't do what you thought all atheists did.
There's also a large difference between ridiculing someone who believes in a god and ridiculing people for believing specifically disproved absurd things, or trying to force said ridiculous absurd beliefs onto others.