"The danger in government supporting one religion (Christianity"
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Thomas Jefferson: "There should always be a wall of separation between Church and State."
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Thus the irony of history. Thomas Jefferson owned slaves, had sex with slaves, and had children with slaves.
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And the last thing Jefferson preferred was to have a bunch of Northern or Southern Christians advocating that "slavery is wrong" and undermining his, then, Constitutional Right to own slaves and treat slaves as his personal property.
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So Jefferson wrote a letter, advocating for a "wall of separation of Church and State" so that his "Constitutional Right" to own slaves should not be infringed upon by "the Church" and "Christians"....and turn any anti-slavery rhetoric that was coming from the Church into anti-slavery rhetoric in The Government. 
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And Liberals still use his "wall" phrase today, when he meant it to defend slavery against busy-body Christians.
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Oh, the irony. Liberals are so funny sometimes.