I haven't been following this story very closely, but from what I can gather the pizzeria doesn't want to refuse service to gay people. If so, what's the big deal? Who cares what someone believes in as long as they're not discriminating against anybody?
On a related note, the Indiana law is clear-cut discrimination. If you actually believe that businesses and communities should be able to systemically discriminate against and force out people under 'religious freedom', you might as well defend the rights of bus lines to force black people to sit in the back rows.