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I'll be interested to know, but seems like there's no straight forward answers.

But I believe that chanting and its rhythms probably mimic the conditions in our fetal development stages, you know that silent sound when you close your ears/being under water; a place where our mind, body and 'soul' slowly develops, and is probably the time where we are most receptive.

And chanting could well be a way to reignite that receptivity and assist in developing beliefs.

That's my theory anyway - words from an unreligious person.