Atheists believe that everything is an accident
Religious people like to say that atheists believe everything is an "accident". But an accident would require a mind in the first place, which had intent. So by saying that atheists believe everything is an accident is implying that atheists believe in a designer, who strayed from it's intent, which is clearly not the position of an atheist, by definition, who does not believe in the existence of any deities that had intent or made an accident.
If there are no gods, then our existence is neither accidental or intentional. It just is. We are the ones who are speculating on whether it's an acccident or intentional, which is irrelevant because from what we can tell, our existence is not the result of a sentient mind.