So, what exactly are the atheist wrong about? A belief in God? Or is it a belief in a particular God, or several Gods?
According to religions that believe in a god(s), yes they are wrong about god. By definition, atheism believes in no deity (god), the other 97.5% of the world disagrees with that assumption
I'm not advocating which is right, wrong or indifferent, just that the belief in
nothing can be viewed just as absurd as the belief in
something and in fact is actually viewed by the majority as well, the 'most' wrong. Many religions can agree they believe in the same deity as the the next church in town, they just don't agree on how that belief should be propagated.
I don't claim to have the answer nor to I prescribe to one belief or the other. But at the end of the day the belief in an all-knowing creator is no more implausible than the thought of a specimen like Taylor Swift being created by dust combining in the earths atmosphere, both of which I consider a religion in faith as neither can/has been proven