That is a huge leap to make based on the statistics from one hub. I am a religious person, but I don't read religious subjects here at Hubpages, just as a matter of personal choice--not because they are not relevant subjects.
I stay away from religious subjects here at Hubpages because it becomes so contentious so quickly. I have seen very simple questions asked here on a religious subject matter and the disrespectful, sarcastic answers start flying - rather than just not answering the question, the answers can be very belittling and mocking.
I just don't want to participate in that.
So write what you feel passionate about. The relevance of it to the general public isn't as important as its relevance to you.