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One thing I remember reading a long time ago as a kid was a story in a book about Egyptian mythology. It featured Greeks who showed up and said, "Our god, whom you know as Horus." 

Very simple little phrase, and the Egyptians used the same phrasing when they replied. There was no arguing over whose god was real, or whose method of worship was right, or which side had the accurate idea of what the god was like- it was simply accepted that there was a god, both sides worshiped him, and they had their own names and practices. And they went on from there. 

It stuck with me (as you can tell), and it's something that I've always liked. So when I started building a new campaign world, it was in my mental design notes. 

One of the things that always bugged me when I started playing D&D was the