That would suit me as a definition. We should make a flag for it.
That said, technically, all Christians are agnostics, because none of them knows for sure that God exists.
I'm talking on a philosophical level, you can't prove anything is real any more than you can prove God exists (to yourself).
At best, you can say phenomena exist, but beyond that, philosophically, I don't see how we could be more than agnostics, even in Heaven.
Naturally, there's the possibility that the Other Side has such vastly different parameters that even this philosophically irreducible doubt can be outdone (I sure hope it can) and an inquiring mind can finally be at peace.
Until then, though, we're all technical agnostics.
For the sake of conversation, Christian Agnostics isn't something I've ever heard of as an association or even faith, but I'd definitely be interested.
If that's how you view yourself, you and I would probably get along on many issues.