Indiana Gov. Mike Pence is expected to sign into law Thursday a religious objections bill that some convention organizers and business leaders have opposed amid concern it could allow discrimination against gay people.

The signing would make Indiana the first state to enact such a change this year among about a dozen where such proposals have been introduced. The measure would prohibit state and local laws that "substantially burden" the ability of people — including businesses and associations — to follow their religious beliefs.

Pence, a Republican, backed the bill as it moved through the Legislature and spoke at a Statehouse rally last month that drew hundreds of supporters of the proposal. The governor planned to sign the bill in a private ceremony, Pence spokeswoman Kara Brooks said.

The governor said in a statement this week he believed the measure "is about respecting and reassuring Hoosiers that their religious freedoms are intact."

In a letter to Pence sent Wednesday, leaders of the Christian Church (Disciples of Christ) warned the legislation was causing them to reconsider plans to hold their 6,000-person General Assembly in Indianapolis in 2017. The CEO of a gathering of gamers considered to be the city's largest annual convention also expressed concern about the bill, which the state Senate passed Tuesday.

The expected bill signing comes just more than a week before NCAA men's Final Four games at Lucas Oil Stadium in downtown Indianapolis, but the college sports organization hasn't taken a position on the issue.

"We are examining the details of this bill, however, the NCAA national office is committed to an inclusive environment where all individuals enjoy equal access to events," the Indianapolis-based group said in a statement.

Supporters say discrimination concerns are overblown because the bill is modeled after a federal religious freedom law Congress passed in 1993 and similar laws are on the books in 19 states. However, the current political climate is far different than it was when most of those were approved because the U.S. Supreme Court is expected to rule this year on whether gay marriage bans violate the Constitution.

Conservative groups say the Indiana measure merely seeks to prevent the government from compelling people to provide such things as catering or photography for same-sex weddings or other activities they find objectionable on religious grounds.

"I think you will find that, if you do your homework in it, this law is not going to allow you to discriminate against anyone else or anyone's rights in this country," GOP Indiana Senate President Pro Tem David Long said.

But the Republican mayor of Indianapolis said he believed the proposal would send the "wrong signal" for the city, and its tourism and convention agency raised concerns that it could lead some convention planners to regard Indiana as an unwelcoming place.

The Indianapolis chamber of commerce and Columbus-based engine maker Cummins Inc. are among business groups which have opposed the bill on the grounds that it could make it more difficult to attract top companies and employees.

Adrian Swartout, the CEO of the 50,000-person Gen Con gamers' convention, said the legislation could affect the group's decision to hold the major event in Indianapolis past 2020. He said it would have "a direct negative impact on the state's economy."

Similar bills have been advancing this year in the Arkansas and Georgia legislatures. Last year, Mississippi enacted a religious objection law just weeks after Arizona Gov. Jan Brewer, a Republican, vetoed a similar effort there amid criticism from major corporations.