Considering the amount of armed Christians, you'd have a bloody revolution on hand soon after they tried this.
115g
185g
55g
123g
147g
"Oh, Mrs. SMith, your new baby needs one more injection before s/he can leave the hospital -- don't worry, it's nothing serious, but the AMA and the governemtnhave added it to the mandatory vaccinations..."
Any complaints or objections would be met with, "But you've already been living with it for years, and it hasn't caused problems..."
Scarily plausible.