The 1993 law was also a useless and unnecessary piece of legislation. It was also politically motivated; few if any of the Clinton era team would support such a law now, and many of them have publicly stated that the law has evolved in a manner unintended. Bad legislation following bad legislation is what this topic is about.
Since the 1993 law was passed, the SCOTUS and other regional US courts have consistently defended gays, lesbians, etc. from being discriminated by commercial enterprises based on their orientation. So the 1993 law has not resulted in supporting discrimination based on the manner in which the courts have ruled, with some potential exceptions resulting in ObamaCare, but these issues are about such things as birth control. But that's for another OP.
The Indiana law, similar to other state laws passed recently on the same topic, is nothing but right wing politically motivated laws to push the X-tian agenda and to support discrimination against primarily the LGBT community. The right wing fundies have lost a few cases around the country the past few years, notably the florist, bakery, wedding chapel cases, and this is their nasty, hate filled manner of responding.
These laws are not necessary; the courts have continued to state that for profit/commercial business or enterprises discriminating based on sexual orientation is illegal, and the sanctity of the insides of churches, including how they operate and whom they serve, has never seriously been threatened in this country and there is nothing that has occurred recently that would insinuate otherwise.
To line up the rabbis, nuns, priests and preachers for a photo-op to suggest otherwise sickens me.