Theism is so confused and the sentences in which "God" appears so incoherent and so incapable of verifiability or falsifiability that to speak of belief or unbelief, faith or unfaith, is logically impossible.
This sense of wonder leads most scientists to a Superior Being - der Alte, the Old One, as Einstein affectionately called the Deity - a Superior Intelligence, the Lord of all Creation and Natural Law.
If 'god' is a metaphysical term, then it cannot be even probable that a god exists. For to say that 'God exists' is to make a metaphysical utterance which cannot be either true or false. And by the same criterion, no sentence which purports to describe the nature of a transcendent god can possess any literal significance.
What! I should call on that Infinite Love that has served us so well? Infinite cruelty rather, that made everlasting hell, Made us, foreknew us, foredoom'd us, and does what he will with his own; Better our dead brute mother who never has heard us groan.
To justify Christian morality because it provides a foundation of morality, instead of showing the necessity of Christian morality from the truth of Christianity, is a very dangerous inversion.