Probably because a some churches will put a disproportionate amount of political rallying around banning something that Numbers 5:11-31 requires in some cases,

Probably because a some churches will put a disproportionate amount of political rallying around banning something that Numbers 5:11-31 requires in some cases, but absolutely never mention marching or voting to feed the poor, help children, or other things. Some undeniably do care about abortion. Some have financial ties to politics and abortion is the easiest wedge issue that they can claim to religiously justify.