Zoroastrianism may not be a religion many people have heard of, but it is a religion. It pre-dates Judaism, and may (in fact) be the foundation for Judaism, Christianity and Islam, as it has as its focus a "One-God," and the expectation that humans act in accordance with some sort of divine "inspiration."
What many don't know is that Zoroastrianism is still practiced today, although its numbers are dwindling quickly. This is because its adherents are not required to proselytize, may marry outside the religion, may change religions in the name of familial peace, and need not raise their children to be Zoroastrians.
It is almost as if its only expectation is that humanity (individually and collectively) should leave the world better off for our having been here. Very simple, but also very profound.
Read this book, and see where the monotheistic religions got their primary impetus.
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