That's not logical at all. Beliefs exist and people hold beliefs. Why would I question the truth of someone's beliefs? If someone says they believe something, I accept that they believe that thing. That, however, had nothing to do with whether what they believe is correct or rational. As long as they don't insist that I believe what they believe, it doesn't really matter.

I once knew someone who believed that bad things would happen if he did not count the number of steps he took while walking. I certainly accepted that he believed that, but always understood that such a belief made no sense at all. However, I was happy to let him count his steps without comment. That had no effect on me, so it wasn't something I ever mentioned to him.

Now, had that person insisted that I count my steps to prevent untoward things happening, I'd have refused to do so. His belief is not mine, and I would tell him so, and explain why, if asked. Similarly, people's belief in deities has no relevance to me. However, such people often want me to believe as they do. When that happens, I tend to say something.