"....... a non-christian country would not allow the country to be overrun?"
Actually it does happen, but it always seems to happen to Countries that are DEEPLY into Religious Beliefs ............... "like let some outsider kick my teeth in".
The Zionist Christians and Secret Societies are actually the biggest curse on Civilised Societies................. they always facilitate the Death Cult in its objectives.
The Enemy Within and the Community Coward that Betrays have always done the most damage to Functioning Communities of any description.