What could you possibly mean by this? Abortions happen in the real world, and can be witnessed. I can go and talk with any number of women who have had abortions. Abortions are based on real-world situations and involve interactions between inter-subjectively verifiable beings - doctors, patients and unborn children. How is this anything like a God claim? The fact that all parties being discussed exist within the case of abortion means necessarily that my "beliefs" about the issue of abortion move into the realm of opinion. I form an opinion as to whether abortion is good or bad for society, good or bad for the mother, good or bad for the unborn child, etc. - and these things can be based on actual effects I see in the world. In the case of "God", it doesn't even get to the stage of "opinion" about God specifically, because no one has demonstrated the reality of the claim in the first place. All I can possibly have opinions of, therefore, are the ideas I am given by other people, or I can have opinions of the people that talk about God and the texts that are written. That's all I've got. I don't have any concrete opinions of "God" because I don't even have a "God" to evaluate!
This is what you'd like to believe... but this simply isn't true. And it has been evidenced by isolated tribes whose mental meanderings never came up with a supreme being concept, but who have survived for generation after generation just fine. The Pirahã, for example:
From what I have read of them, there is no talk of their being morally bankrupt, but instead that they have strong kinship systems, elect no leaders (imagine that!) and actively do not tell one another what to do as an intrinsic part of their culture.