From the article:

The church’s remarks come after the act’s sponsors added an amendment to the House-passed bill exempting religious organizations, including faith-based universities, from providing “services, accommodations, advantages, facilities, goods or privileges for the solemnization or celebration of a marriage.” Neither could the act be used to alter the tax-exempt status of any organization.

They get to maintain their exclusionary practices. They are only supportive because they’re not having to get a bunch of lawsuits thrown their way.