Certainly you can. Agnostics aren't certain, but they can still have beliefs. My mother said she struggled with her faith every day; that makes her an agnostic Christian. Myself, I'm convinced that gods don't exist, but I don't know that for a fact. I'm an agnostic strong atheist. Theists believe gods do exist. read more
You can be whatever you like, my friend. But if you believe in God, then that makes it tough to be a true agnostic. But you could still have agnostic ideals and questions. I think they'd call you an agnostic theist. read more