The activists have really lost their crap over this, which is off considering:
(1) there is no material difference between this law and existing federal law, and more importantly
(2) sexual orientation is not even a protected class under Indiana law.
Thus, businesses can already discriminate against gays (aside from perhaps some municipalities with specific ordinances) regardless of this law.
The law appears to have been prompted by the Hobby Lobby religious freedom case, which was about Obamacare, not gay marriage.
What a ridiculous controversy.