|98% of Catholics use birth control proscribed by the hierarchy|
The graph below shows current polling on public support, broken down into denominational factions ("white evangelicals" is an unfortunate-but-necessary separate race-based category, because the right-wing white populism that has infected many self-defined evangelicals among the GOP's largely lily-white base is a more defining characteristic than their asserted Christian values - values which are interpreted quite differently among very traditionalist or fundamentalist Christians who are also informed by the real-world experiences of African-Americans.)
Note that support for the contraception coverage is even higher among Catholics than the general population, while "white evangelicals" - i.e. demographic terrain for a major "usual suspects" segment of the hard-core GOP base among resentment-driven white cultural populists - are the predictable locus of dissent :
the mouth of Rick Santorum: "This is a very hostile president to people of faith. He’s a hostile president, not just to people of faith, but to all freedoms."
Santorum, true to form, is some combination of irresponsible and perverse in his mendacious mudslinging. In fact, Santorum himself is hostile to freedom in that he has expressed opposition not just to a woman's right to choose as regards abortion, but to all forms of birth control. He is on the extreme wing of the anti-gay equality crusades. Santorum is shouting from the gutter. That he cloaks his hate and lies in high-volume religiosity makes them just that much more disgusting.