the key here is not using Sacred Sites as the method of victory. that has been done on Deity and is commonly viewed as either a "cheap" kind of win or not intended to be a valid method. either way, this is meant to be a non-SS cultural victory. also, there is the assumption of standard settings, 8 civs/16 CSs with non-cooked maps or special settings like Policy Saving. im with others in that trying this at lower diffs adds more difficulty to it. maybe start at Immortal and see how you do.