This is not true. The people who teach evolution really believe it. It doesn't help your case to overstate it, or impugn the motives of your opponents.
No, not all of them do. You would be hard pressed to find many jr.high biology teachers who believe what they're teaching as introductory evolutionary dogma. The people who are isnisting that it be part of a curriculum which isn't even at a level to introduce such ideas believe only in preserving their own positions in administration.
The academecians who believe this sort of thing are far distanced from our children in public schools and have nothing to do with teaching it at that level. It isn't overstating the case to say this at all.