Consider this: the First Amendment to the Constitution prohibits public schools from teaching or promoting atheism in any way. How do I know this? Well, the religion clauses of the First Amendment protect the "free exercise" of religion and at the same time forbid the "establishment" of religion. Courts have routinely held that the free exercise clause protects not only religious beliefs but also the absence of religious beliefs. If you are fired from your government job because you are an atheist, your First Amendment rights have been violated. In other words, the term "religion" means not only "religion" but also "atheism."
Yet if the free exercise clause defines religion in a way that includes atheism, then the no-establishment clause must define religion in the same way. So the agencies of government are prohibited from "establishing" not only religion but also atheism. This means that just as a public school teacher cannot advocate Christianity or hand out Bibles to his students, so too public school textbooks and science teachers cannot advocate atheism.
I'd like to see Christian legal groups suing school districts for promoting atheism in the biology classroom. No need to produce creationist or ID critiques of Darwinism. All that is necessary is to parade the atheist claims that have made their way into the biology textbooks and biology lectures. The issue isn't the scientific inadequacy of evolution but the way in which it is being used to undermine religious belief and promote unbelief. If the case can be made that atheism is being advocated in any way, then the textbooks would have to be rewritten and classroom presentations changed to remove the offending material. Schools would be on notice that they cannot use scientific facts to draw metaphysical conclusions in favor of atheism.
In this way Darwinism in the public schools would no longer be a threat to religion in general or Christianity in particular.