Regarding the Hidden God Problem.

It would seem that God, assuming a God of course, went to a lot of time and trouble, effort and energy, to establish His existence to a rather tiny band of quasi-illiterate goat / sheep herders in a rather restricted geographical region of the world thousands of years ago. Alas, there's no evidence that survives all of His revelations regarding His existence. So, if God wants to obtain the faith of the multitudes in this more modern, global, and scientific age, He really needs to update His public relations and advertise His brand in such a way that there is no doubt as to His existence. Surely it is not logical to expect the multitudes thousands of years after-the-fact to have the same True Faith and Belief systems in place as did those semi-illiterate goat and sheep herders, based on evidence available to them then but which has evaporated in the fullness of time and is no longer available. So, if God exists, then yes, I'd expect Him to provide an update as to what He's been up to for the last 3000+ years and thus instantly convert over seven billion people into accepting Him as the One True God. It shouldn't be difficult. That God remains hidden speaks volumes IMHO.