First of all, I don't really know how the hate crimes laws are worded, and it's very probable that some better, clearer definitions are needed.
But unless Michigan has laws against giving anti-homosexuality sermons, and are using those laws to prosecute religious leaders, I can't figure out what this religious group is talking about. For there to be a hate crime, there must first be a crime.
The group clearly seems to think that hate crime laws are the thin end of some kind of wedge, but I'm not at all sure where, exactly, they think such laws will lead. If anything, it seems that recent public opinion has been to narrow the definition of what constitutes a hate crime, not widen it.
All the hate crimes laws are meant to deal with are people who dislike those who happen to be gay (or of a different race, belief system, etc.) so much that they go out and throw rocks at, threaten, attack, or otherwise commit crimes against people belonging to those groups. If all this religious group wants is the protection of their right to sit around quietly hating other groups, or talking among themselves about what horrible sinners Those Other People are, they've already got that in the U.S. under the first amendment, and I don't believe anyone's threatening to take that away.