'hen I could choose from Judaisim, Christianity or Islam.
Now obviously the first two are the same God. Again it is arguable that the God is Islam is the same as in Christianity, after all Jesus is of course in the Qu'ran. Again this idea is very debated.
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Sikhism and Hinduism do not have the same God; the Abrahamic faiths do however, there is a clear developmental path throughout the faiths. I know some would disagree.
I ahve sat at university through amnay a debate on the whole Abrahamic debate but never once on the first two faiths sharinga God! Now, they share a lot of roots of course but they are separate faiths.
Hindu god theory is complex anyway: current theory is that village and Brahmanic faiths have actually evovled into different beleif systems: Brahmanic faiths have the ancient faith that was truly monotheistic in origin if not practice (all otehr gods being aspects of the sigular deity), but village hinduism (bit of a patronising name I now, sorry, was the technical term for the theory though) covered people who accepted a multiplicity of gods; tends to be very intersting how new ones can be absorbed, the story of Santosi Ma is one I find fasciniating.
Now, ahven't studied since 2008 (not religion anyway, gone off track for my MA) but will go google for the Sikh / Hindu theory, intersting to learn more.
Oh and WRT to Atheistic system- i;d abck it. As longa s people are able to practice their chosen faith personally, I fully believe that it should be within a secular society; the faith practised at our lcoal school bears no resemblance to the Christianity I foolow, and I would far ratehr children are taught about it from an educational perspective but not a 'this si what we belive' way (village school, not a lot of options- local ones tend to be Church ehre).