Really interesting to see that Charles R. Saunders was published in Dragon. I knew him as a local newspaper columnist and non-fiction author, and only found out about his fantasy work after his death.
In my area in the 1980s there were quite a few campaigns with varying levels of Christian influence. Mostly this meant that the campaign was pretty much standard D&D with no evil PCs and a general agreement that Christian ethics = Lawful Good. I did play in one that featured the Abrahamic God...
Ars Magica has always been the game I admired most, even though I have never actually played it. The setting and style of play described in the books had a huge influence on me, but it was hard enough to find enough people to play the top-tier RPGs, let alone a more challenging and open system...