It is people's rights to believe that. But Pence took it several steps further. He made it so that if you believe that, you can legally discriminate in the name of it. He gave "Christians" (of course the language wasn't specific, but the discourse makes it obvious) a special right, an extra right, and that is the right to discriminate just as long as it's a part of your religion. When "gay cake row" was a thing, Pence wanted to make sure he offered protections to those who would discriminate against the LBGT community. Of course they don't see it as discrimination, but "freely practicing their religion," but the facts are it has already been ruled by the Supreme Court that it doesn't matter your excuse, you can't discriminate against a number of qualifiers, even if you have a religious objection against someone.