At least a believer in God takes a position and stands by it.
Actually, religious folk also admit there's no way to determine if God exists, hence faith, something believed. Much of life is faith based. In plane geometry, a postulate is a statement accepted as true. Postulates are not proven, nor can they be proven. You either believe them, or you don't, or you have no opinion. But, if you don't accept them, you can't enter the realm or plane geometry.
It depends on whether or not you are talking about so-called "weak agnosticism" or "strong agnosticism". Weak agnosticism is logically equivalent to atheism, the only difference being that the atheist has the fortitude to accept the logical conclusion of their ideas. Strong agnosticism is something else altogether, and while most agnostics do not espouse this variant, one could make a very sound case that this is actually the most correct position of all.
I personally don't label myself anything, as I am "non-religious" in the blandest sense of the word. I don't bother thinking about it any more, though I enjoy engaging in the meta-arguments.