This is nothing more than a game of semantics. As per brother Ahmed's post, you could just as well have called this region of the brain the group/nation/creed module. There are so many overlapping functions of different parts of the brain, precisely because it is so complex, and yet you are reducing the entire hippocampus to this supposed 'god' module. Please consider the basic definition of the hippocampus:
"The hippocampus is a major component of the brains of humans and other mammals. It belongs to the limbic system and plays important roles in long-term memory and spatial navigation." - Wikipedia
"People with extensive hippocampal damage may experience amnesia—the inability to form or retain new memories." - Wikipedia
If you really wonder whether the hippocampus has anything specifically to do with religion, I suggest you present one example where damage to the hippocampus caused a person to specifically be unable to learn to 'be religious'.