I disagree. If something is observed or merely be conjectured, it can be questioned by those who do not believe, or who have doubt. Any phenomenon that exists is capable of being observed, in the strict definition of the word.
However, god is defined as supernatural, which means that it is not capable of being observed. You cannot have your cake and eat it. Either an entity has a measurable and observable effect on existence, and is thus natural, or, it does not exist. Believing in a god is contrary to observation, and must necessarily cloud your judgement.
Further, believing that your deity is moral despite the doctrine of Damnation is absolutely contrary to all notions of Reasonableness. It is an act of sheer depravity to justify the doctrine of Damnation, and for example, to justify genocides committed in his name, as many have done.
People say that if you abandon belief in god, you are capable of great acts of evil. I think it is more true that if you belief in the righteousness of the doctrine of Damnation, you are capable of great acts of evil, and if the justification comes from the certainty of god's existence, then you are of the mindset where you have abandoned all reason and all notions of morality. If your ethics is determined by something that you cannot observe and which you are unwilling to appraise the appropriateness of the doctrine, then naturally, if you suddenly abandon belief in god, you truly are capable of great acts of evil, because you have never done your own reasoning and because treating others based on empirical notions of ethics will be utterly alien to you.