That's bullshit. Christian societies are the most accepting of other faiths. By your logic no one can live peacefully with anyone else.
You mean Catholic societies. Then yes.
Christian governments are the most tollerant. That mormons only live in communities with mormons is irrelevant.
"Christian" in the modern terms is too broad. Through history, only Catholic societies managed to reach the perfect balance between tolerance and homogenous communities. Protestants took a fraction of time to get infiltrated and demolished. Catholic kingdoms in Europe lasted many centuries. America only became great thanks to jews loansharking Europe after two world wars; it was a diplomatic dwarf before that.
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