Why Do Atheists Criticize People's Beliefs?

[Mermaid]

Why?

Apart from the wording, it's a question of burden of proof. If some people claim to know an almighty creator figure of the universe, that's a positive claim. If the claim isn't logically justifiable it is probably wrong, and I as someone who is on the default position of not claiming a personal creator figure on those grounds am right to criticise this belief as probably false. Vice versa, criticising the atheist holding the default position of no claim, without having proper evidence, makes you wrong.

Ok, I see, fair enough. I am just not an arguer, so I tend to default to not arguing with people about their beliefs. As soon as it starts to have an effect on my life, I'll speak up and tell them to stop it, but I don't think I care about the burden of proof otherwise. If it makes you happy to believe in all of that bullshit, whateverrrr.