Keyplus, if you're talking to me, all I can say is for once Mohammed was right, so thank you for the link. I watched a few seconds of your video, but it didn't seem relevant to this subject, so I stopped it.
Jake, //Firstly pretty much every civilisation in the world developed the notion of a God.//
That was Huderon's point, but like his, it's irrelevant. Children aren't aware of that until someone teaches them.
//I suggest humans have a natural tendency to feel experiences of a religious nature and these are a by-product of our intelligence.//
Whilst an innate sense of spirituality may develop in a human being, that does not equate to 'religion' and the notion of gods. The question is if someone had never been exposed to religion in any sense of the word, would that innate sense of spirituality materialise at all, and if it did, could it be considered 'religious'? Since the subject of the experiment would be completely oblivious to the existence of religion, I don't think so.
Similarly, with the 'God Helmet'.
//Persinger reports that at least 80 percent of his participants experience a presence beside them in the room, which ranges from a simple 'sensed presence' to visions of God.//
But these people have all been exposed to religion in some way - we all are - so they can hardly be considered suitable examples. If they hadn't then the concept of 'God' would not be present in their minds. They might experience a 'presence', but they wouldn't think it was God, because for them there would be no such thing.
//Many subjects have reported "mystical experiences and altered states//
Certain drugs can produce the same effects - and again, these people have all, at some time, been exposed to stories of religion and tales of mystical experiences. Hence all these ideas are already present in their minds before the experiment begins.