I'm about to flip a coin.

Can we make sure we're on the same page regarding the definition of belief? As I understand it, belief means accepting a claim. Disbelief means not accepting a claim.

Do you accept the claim that this coin will land heads? This is a yes or no question. If you withhold judgment, that means you do not accept that claim. You do not believe it will land heads. This is notably different from accepting the claim that it will land tails. Not believing that it will land heads is not the same as believing that it will land tails.

The most reasonable position is to not accept either claim. It's a 50/50 chance.

Theism means accepting the claim that there is at least one deity. You either do that or you don't. Any option you take that involves not accepting the claim that there is at least one deity means that you aren't theist. You are without theism. There's a word for that.