Well, then, they probably shouldn’t have let him sign at all — and certainly should not have lied to him to persuade him to sign on.
Chuck Colson didn't lie to Ron Sider. Sider, in spite of his left-leaning redistributionist beliefs, is still an evangelical believer who understands homosexual behavior to be immoral. He is misguided but not evil. Those who would impose homosexual marriage on the US are evil. They have goals that go beyond their stated motivation of "equal rights for gays." They wish to destroy any influence evangelical Christianity has in the US. It is THEY who are lying to the well-meaning-but-misguided Ron Siders within Christianity.