Dr. Ben Carson, a pediatric neurosurgeon at John Hopkins University and a conservative celebrity, last week told a Christian conservative group opposed to gay marriage that such unions endanger God's relationship with his people and “everything else in the Bible.”

On Friday, Carson spoke to the Illinois Family Institute (IFI), the leading Illinois-based group lobbying against passage of a proposed bill which seeks to make Illinois the 14th state to legalize gay marriage. The Illinois House could vote on the measure as early as this month.

(Related: Illinois gay marriage bill might not see House vote this year.)

Carson described the relationship between Jesus Christ and his followers as similar to a marriage.

“Think about the implications of that,” said Carson. “When people come along and try to change the definition of marriage, they are directly attacking the relationship between God and his people.”

“And that's the reason it's so important for them to change the definition, because if you can get rid of that, you can get rid of everything else in the Bible too.”

In April, Carson stepped down as commencement speaker at the John Hopkins School of Medicine and apologized for comparing gay nuptials to bestiality and pedophilia during a Fox News interview. In his apology, Carson said that he was “saddened” that “my poorly chosen words caused pain for some members of our community and for that I offer a most sincere and heartfelt apology.”

“I was amused how they tried to paint me as a homophobe, they came out with all guns blasting. It was funny, it had the Chick-fil-A effect,” he said Friday. “They realized they were actually doing me a favor so they stopped.” (The video is embedded on this page. Visit our video library for more videos.)