Some Christian groups would like to use public schools to distribute their religious material. The Gideons are the best known example of this and they have been distributing Bibles in public schools for decades, though more and more schools are ending this unique relationship. Sometimes this change is due to a recognition of the untenable legal position and sometimes it's only after people complain -- even Christians, in some cases. Should schools allow this sort of relationship exist with religious groups or should it be prohibited?
Many Christians seem to think that the absence of overt force means that some behavior is constitutional, and therefore it's constitutional for religious groups to come in and offer their religious material to students. This is not correct; schools may not be threatening to punish students who don't take Bibles and they may not be offering any positive inducements as rewards, but they are giving the impression of supporting the Gideons by giving them a place of privilege unavailable to anyone else The state has no legitimate authority to communicate in any way that the Gideons or the Bibles are favored, supported, or encouraged.
Once a school admits that they are promoting particular religions, religious beliefs, or religious scriptures, they are admitting that their behavior is illegal. Still, some Christians object that they are suddenly expected to handle evangelization without support from the state. Why would anyone protest the fact that they and their religious organizations must shoulder the full burden of proselytization... unless they fear that without state support, they won't get very far? This is the fear that one's beliefs can't stand on their own in equal competition against alternatives. People who want the state to tip the scales in their favor are admitting their own doubts and insecurities.
Can you imagine the outcry if a freethought group even requested permission to distribute Freethought literature in public schools, much less were allowed to? What if communists asked to distribute the Communist Manifesto? What if Muslims asked to distribute copies of the Qur'an or a biography of Muhammad? Yet so many see absolutely no problem with Gideons distributing Bibles in the same manner. In fact, this points to a great tactic to use against such misuse of government power: insist on being allowed to distribute freethought, atheist, or communist material on the same basis as Christian material is distributed. It's cheaper than a lawsuit and will probably end the unconstitutional policy much faster.