I think the Christian God just as unlikely. We do not speak of faith that two and two are four or that the earth is round. We only speak of faith when we wish to substitute emotion for evidence. The substitution of emotion for evidence is apt to lead to strife, since different groups, substitute different emotions. It is partly the terror of the unknown, and partly the wish to feel that you have a kind of elder brother who will stand by you in all your troubles and disputes.
Fear is the basis of the whole thing - fear of the mysterious, fear of defeat, fear of death.
Theology, on the other hand induces a dogmatic belief that we have knowledge where in fact we have ignorance and by doing so generates a kind of impertinent insolence towards the universe. Uncertainty in the presence of vivid hopes and fears is painful, but must be endured if we wish to live without the support of comforting fairy tales. I have some slight regret that this did not happen, as I might have become a god, which would have been very chic for an atheist. The question of the truth of a religion is one thing, but the question of its usefullness is another. I am as firmly convinced that religions do harm as I am that they are untrue.