This is a problem that arises mostly out of the liberal side of religion, that religious people are redefining their own personal gods to the point that A) for all practical purposes, their god doesn't exist, and B) there are so many different definitions that it could be said that they are no longer functioning as a single cohesive religion. I find this quite interesting, as these kinds of theists in a sense are doing my work for me.
For the most part this mainly encompasses those who have redefined god into some kind of deistic being that doesn't interfere with the earth. This includes those people who give incredibly weak reasons for why god allows suffering to happen without interfering. A weak answer would be something like "god doesn't interfere with free will". The new testament, and in fact the bible as a whole is filled with examples of god interfering with free will, the two most memorable examples would be in the exodus, where god hardens the Pharaoh's heart just so god can murder all the firstborn of Egypt and cause many more to suffer and die from pestilence and plagues, and Paul's dramatic roadside conversion. I'm not quite sure how far some Christians would be willing to take the free will argument, but if you take it to its inevitable conclusion interfering with a disease that is taking over a person's body would also be interfering with the free will of the disease. Even though the disease itself is not a conscious entity, its primary purpose is to propagate, and stopping the disease dead in its tracks is most certainly interfering with that purpose. Even without taking the argument to that conclusion, the theist has effectively routed their god to the point where he is unable to act without interfering with someones free will, so their god serves no practical purpose, and as far as I'm concerned, has then been defined out of existence.
Now for B)..
Religious faith has become such a personal thing that people have almost created their own sub-religions. This would be very unlikely to happen if a given religion were actually true. If we look at this from the assumption that all religions are untrue, this is exactly what you would expect to find. Since the religion is not true, and the god of the religion doesn't exist, there is no unifying force to give people consistent revelation of the true god and of the true religion. If it were true, the god would be able to 'reveal' to people his nature. Surely this would be a violation of free will though, so there is a slight contradiction there.
That's all I have to say on the matter, feedback is appreciated.