One of the fundamental flaws I often criticize about religious belief is when believers want their cake and eat it too. Specifically, I refer to when their arguments rely too heavily on special pleading. And no, adding caveats to the definition of a god does not bypass special pleading. I can redefine chocolate as the essential first cause of the universe, but that doesn't make the definition valid.
But other examples of special pleading include arguments like this: god is mysterious, unfathomable and uknowable but somehow believers are granted special knowledge of who this god is, what it is and what it demands. Believers typically justify this via "special revelation," that they or their religious founders have been granted special knowledge by that god to carry out the divine will. Each religion and sect claiming special revelation typically considers the special revelation other religions and sects as heresy or at least attributed to human error. But since there are so many special revelations, how does someone not raised or converted to one particular orthodoxy distinguish which are the truly divine revelations and which are heresy? This problem is informally called the argument from inconsistent revelations. One of the supporting criticisms against divine revelation is the way it tends to follow cultural and geographical boundaries.
A point I've made before is that no religion has any better argument or evidence to support it than any other. Believers aren't basing their claims on independently observable phenomenon, they're projecting what they think should be true rather than what they can demonstrate to be true. There's no common experience for believers to reference so revelations vary from culture and region and even among different believers. This leads us to the skeptical position that if a god does not leave any traces for us to observe, then we have no reason to assume that anything we see supports the existence of this god. If this god is unknowable and incomprehensible, then we have no reason to assume anyone understands anything about it and can accurately represent it.
So which is it? Is a god knowable or not? If not then the discussion is closed. If so then show us examples that clearly demonstrate how this knowledge is valid and not human bias. Excuses aren't enough.