If we make such a claim, but if we only say we believe that God exists that is not a claim.
Do you make claims that you don't believe?
When you believe things, aren't the things you believe claims?
I've explained this many times and still for the life of me I can't see what is so hard to understand about that.
"The sky is purple". This is a claim
"I believe the sky is purple". This is an expression of belief of said claim.
Adding the prefix of "I believe" doesn't seem to change anything. It's not mentioned explicitly in the first, but it sure is implied. The alternative to said implication is that the one making the claim is lying.
If you say "the sky is purple" and we assume you aren't lying, then surely it is implied that you believe that claim to be true, right?
So how is that any different from stating it explicitly like in "I believe the sky is purple".
Do you make claims you don't believe?