There are Christians who claim that atheism assumes there is no god (https://lyleduell.me/2017/02/02/the-assumptions-of-atheism/). This is typical of theists who are self-styled atheist experts. Apparently this assumption (which hasn’t actually been established, merely claimed and assumed to be true) is false because
No one can prove that there is no God
If it’s not possible to prove there is no god, then equally it’s also not possible to prove that there is a god, which leaves the theist in the uncomfortable position of assuming there is a god, with no proof, while pointing a finger that the atheist saying you can’t assume there is no god because you can’t prove there is no god.
I participate in regular conversations with theists and atheists and the claims of atheists vary a lot. There are those who confidently claim there is no god and there are those who take the softer road that belief in god is not reasonable if said god cannot be demonstrated. The majority take the latter. It’s not clear from the blog post I linked to if all atheists are lumped into the assumption claim or if it’s only the former. What’s also not clear is how the author thinks atheists come to these assumptions. If the assumption if merely because the lack of a god can’t be proven, that that is an entirely reasonable position to take. Given that you can prove neither the existence nor the non-existence of a thing, assuming it exists is the least reasonable position to take.
Next we get to
The second assumption, which I have found in most atheists, is the belief that they are smarter than those who believe in a God.
Yes, there are many atheists who will comment along the lines of “only a stupid idiot would believe in a god”, or other less salubrious phrases. These are equally matched by those theists who quote Psalm 14:1 or other bible verses which justify looking down their noses at non-believers. I am pretty sure I’ve been called all sorts of variations of stupid by theists far more times that I’ve seen atheists bat it back. The numbers aren’t actually important though because the insult isn’t useful regardless of the direction it flows. It is a tad dishonest to accuse the atheist of assuming higher intelligence while not acknowledging the reverse is an equal problem.
The blog post then makes a reference to poll that claims that 51% of scientists believe in god. The link associated with the claim didn’t work for me but it seems to be this:
Note that it’s 33% believe in god and 18 believe is some form of higher power that’s not god. 10 of those 33% are religions other than Christian. Those stats don’t looks so great compared to the 41% with no belief. But I’m not sure what that has to do with intelligence and belief. Intelligent people sometimes believe dumb things. That happens the world over. Trying to point score on an intelligence comparison achieves nothing other than making it look like you are trying to justify an assumption you have.