To answer your question, it's because many religious people believe that morality is derived from revealed religion, when in fact morality evolves outside of (and often in spite of) the skewed 2000-year old goat herder mentality.
It's given credence over politics that really matters because it gets people pissed off enough to vote. Do you think that if abortion were permanently legalized (without threat of reversal), the social conservative base of the GOP would go to the polls? Most people don't care about China's rise in Central Asia or Russian power plays or EU investment in Africa and South America because it doesn't play into their narrow view of America as a cultural and political hegemon (something we are loosing for all those reasons, but don't tell the Bible belt).
As long as people care vehemently about pushing their religiously-motivated morality upon others, politicians will use "issues" like abortion, death penalty, and right to life as political footballs.
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