What a target rich environment your post is.
(1)"ethnically cleansed" -- you are making a demonstrably false comparison between non-chosen ethnicity, and deliberate sinful sexual conduct. Ethnic "contamination" does not exist; sexual contamination is an all too well documented phenomenon.
(2) "whom he felt" -- this has nothing to do with feelings whatsoever. The Christian resistance to "gay rights" is the result of deeply well thought out moral reasoning, with revelation as a starting point. Also, an almost equally strong case against homosexuality can be made from a combination of history and natural law, without any religious references at all. Either way, feelings have nothing do to with it.
(3)"because Hitler was Catholic" -- if you knew anything at all about Christianity in general or Catholicism in particular, you would know that Hitler was by NO STRETCH of the imagination, a PRACTICISING Christian, Catholic or otherwise. Only PRACTICISING Christians enter heaven, not those who were raised in church and abandoned its teachings in adulthood. If you repeat that "Hitler was Catholic" calumny one more time, I shall be forced to ping BlackElk.
(4) "discriminating against a child because her parent is homosexual" -- again, you must be reminded that the contract was between the Christian school and the parents, and the latter are required to uphold Christian moral standards in the home. This is to protect ALL the children in the school from unwholesome influences that might be brought in through less-that-committed families. By definition, a homosexual couple can't uphould Christian moral standards except by breaking up and publicly renouncing homosexuality -- which they did not do.
Furthermore, the flash point of the controversy was a pro-homosexual speech made at the school by the girl herself --which ultimately proves the school's point: corruption in the home will spill over into the school.
If you believe for one moment, that this whole scenario wasn't set up by the lesbian "family" precisely for the purpose of attacking Christian education, you're living in a dream world.
Finally... This problem isn't just about homosexuals -- a few years ago there was a case where a stripper was sending her kid to a Christian school. She was told to either change jobs or pull her kid from school. She refused to change jobs, even when people stepped forward and made offers.