OK, Sandy thank you for being a little more specific.
I see three items then that you are objecting too.
1. Creationism is not taught in public schools and that is therefore anti-Christian.
You reasoning seems to be that evolution is taught in public schools. You continue that if you believe in evolution that you cannot believe in an all knowing, all powerful, all present God. I don't know how you get to this conclusion because it is a wide leap of logic. I believe in theistic evolution myself and see no problem with believing in scientific evolutionary process and the existence of a creator God.
You seem to think that all Christians would just assume that it is a good idea or necessary to teach creationism in the public schools. But my Church, the UMC, is on record opposing the teaching of "Intelligent Design" in public schools as an infringement on religious rights by choosing to teach a specifically religious viewpoint in public institutions. I could quote the resolution to you if you'd like. But the point is that this is not the view of all Christians by any means.
2. Secular Humanism
As you describe secular humanism I do not believe that is being taught in public schools or that public schools have the goal of teaching secular humanism. In fact I know way too many Christian school teachers, Christian administrators, Christian School Board members, and Christian PTA leaders who are deeply involved in the local public schools to believe any such there.
Here in Sioux City several United Methodist Churches, including my own, work closely with local elementary schools in aid to the poor through food assistance and providing school supplies and clothing. Members of my own church help as class room mentors. Secular humanism isn't being taught in any school I've had a connection with or that my wife has taught in.
3. Christians have to hate gay people and public schools don't teach that effectively any more.
Yes, I know, you won't like the way I've titled the above. But what you are telling me is that we need private Christian schools so that Christian kids can still be taught that gay people are evil, bad, sinful, and hell bound. You'll get no sympathy from me here. It isn't "moral relativism." There is no non-religious reason to treat gay people in any other way than as equal citizens in an equal society. It takes a religion to single them out and make them into lepers.
So to sum it up you seem to be arguing that, we need private Christian schools to allow wealthy white Evangelical Christian folk to get their kids out of integrated public schools so that they can make sure their kids believe in creationism and that gay people are horrible sinners. Boy, great selling points.
Is it at all possible Sandy that you could sell the values of a Christian school without public school bashing? Or is it necessary to the survival to Christian schools to make sure the public school system is painted as evil? You'd not have a vested interest in that would you?