Because gods aren’t a logical inference from evidence. To accept that a god exists involves some sort of unjustified leap in the chain of reason that violates skeptical principles.Why would you say skepticism is incompatible with theism as such? I don't see skeptical views as a barrier to theism, rather I see that as a misperception.
I get that there are theists who say they’re skeptics, but in my experience, when you scratch the surface of why they believe, you invariably wind up finding some decidedly unskeptical things.