Elements of the anti-gay movement have been promoting the idea that there is a gay agenda to indoctrinate children and "convert" them to homosexuality. While there certainly is a movement of sorts to promote the idea that homosexuality is not intrinsically bad (in contrast to the beliefs of the religious right, Islam, and a few other extreme religions) -- an idea which is generally accepted by the educational and scientific establishments.
The idea that educators would be trying to somehow change children so that they would become homosexual upon reaching sexual maturity, however, is absurd, as there is absolutely no evidence that homosexuality can be successfully taught or untaught.
These claims by the anti-gay movement are probably an effort to undermine, by illegitimate means, the legitimate teaching of the non-harmfulness of homosexuality. As such, they are part of the war on education.