I wonder why you equate atheism with belief in anthropogenic global warming. I am an atheist and I think AGW is complete nonsense. I do believe in global warming and global cooling. I even believe that humans have a minuscule effect on climate. The idea that we are destroying he planet with our cars and air conditioners is ludicrous. So why so often is atheism conflated with AGW. And why is it so important to prove that atheists have faith about something?. That would not prove that faith in god is justified. It would just mean that the belief they hold by faith is also unjustified.
Personally, I can’t think of one thing that I have faith about, faith being defined as belief without evidence or in the face of evidence to the contrary.
Then neither do I since I believe that faith in God has mountains of evidence. Belief that an incredibly stable and efficient ecological system like Earth could come from a million different random chances is what is preposterous.
Plus, there are a few things that defy logic but are central to our existence. For example, if you freeze oxygen, it condenses. If you freeze hydrogen, it condenses. But if you freeze water, which is nothing but hydrogen and oxygen, it expands. No scientist can make sense of that yet those who believe God orders the universe can accept it as part of His plan.