ElderBerry: Most religious groups have large numbers of people who are agnostic if they are honest with themselves.
There is no way to demonstrate this. I think you are stating it because it makes your stance seem more common and therefore the dishonesty is less of a problem.
But that is still not my concern with it. Be agnostic if you want. But please do not try to hide behind "no one can know for sure" as if you can apply that to everything. By staying in, you tacitly approve of --and possibly help to maintain-- a set of bad and dangerous policies.