It’s none of your business how Rick Santorum lives his private life, as long as he doesn’t intend to force his views on the country. It’s a matter of free choice and freedom of religion. He’s entitled to his own beliefs.
Do you object to Romney being a Mormon?
There are ways that the government can influence people’s views on a topic without either banning or subsidizing any particular choice.
They do it all the time - they call them “PSA’s”.
Smoking is a good example. Is smoking banned by the federal government? Nope. To the contrary. But they sure do spend a lot of time and money on advertising to reduce the usage of the product.