The Founder fathers were not atheist but consisted of a diverse group of different religions who intended to keep religion in government, but you had your choice of which religion you wanted to be affiliated with.
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If you "had your choice" but they intended to keep religion in government, who decided which religion was to be kept in government? Just how would that work? They felt, and rightly so, that religion had no place in government. Sometimes people confuse the argument to think atheists are saying that they wanted NO religion at all. I'd argue that our "founding fathers" were way more tolerant of different religions and non-belief than the christians of today. Why do atheists post on a "religion" forum is the question ask a hundred times and answered a hundred times. This is one reason. We were intended as a country that would practice tolerance but we have/had groups that don't like that so it changed over the years to christians having free reign to use religion to oppress and discriminate against people that didn't believe, or didn't believe the way they think they should. It's time that changed.