Christians believe in free will. So do Orthodox Jews. But Atheists adamantly deny free will, and insist that they are preprogrammed robots.
I thought that Atheism was just a denial of Theism. Nope. Belief in Atheism comes with a whole set of other beliefs, including free will denial.
Free will is a philosophical issue, and one can believe in it or reject it. The Atheists will try to tell you that a scientific worldview requires rejecting free will. This is false. There is no compelling scientific argument against free will.
So Atheists are choosing to deny free will for other reasons. I have listened to these guys at great length, and it is hard to understand.
Update: The Freedom From Religion folks have moved into a bunch of leftist non-religion issues, such as what they call trans rights, disability rights, and voting rights. Those are euphemisms for things like letting boys compete in girls sports.