One witness named Brandon Russon told CBS News that shortly before Kirk was shot, he was discussing his Christian faith with a different attendee. In that conversation, Russon recalled Kirk proclaiming to the crowd that “Christ is Lord” and the Son of God had “defeated death.”

This was a common trend in his campus activism.

Earlier this year, Kirk debated an atheist student who asked him about working with atheist conservatives. Although Kirk said he would welcome anyone who supports good causes, he cautioned that atheism cannot produce a proper moral code.

“You must be an honest atheist and acknowledge that morality is definitionally subjective without a belief in God,” he said. “That you cannot be an atheist and believe in objective morality. It is an impossibility and true atheists will acknowledge this.”

Kirk noted that atheists have “ought” claims. They suggest that things ought to be a certain way, such as that “murder ought to be wrong,” but cannot proclaim objective moral standards “if there is not a divine eternal power over you.”

“It’s a very important truth claim because when you do not have objective truth anchoring your society, then it becomes a power struggle,” Kirk warned. “If you do not have truth, then power will reign. Whoever can get the most amount of power then ends up having the most amount of say over society. We believe what is objectively right, true, good, and beautiful should be transcendent over society.”

Kirk often discussed his faith in interviews, including one with prominent atheist Bill Maher on the “Club Random” podcast this year, where Kirk explained the Christian doctrines of grace and atonement.

“We believe [Christ] … suffering the death that he did on the cross was him atoning for our sins, the sins of humanity” Kirk told Maher. “… It is at a core a statement of human equality, that we’re all sinners, we’re all screwed up. We all got problems. We all got vices. … We all fall short of God’s standard and Jesus makes us whole.”

Throughout his career, Kirk encouraged young people to get married and start families, argued against abortion and gender ideology, and worked to inspire college students to follow Christ.

Charlie Kirk’s relationship with the Catholic Church

Although Kirk was Protestant, he often engaged in theological discussions with Catholics. His wife, Erika, is a baptized Catholic, and the couple and their two children have been seen at a Catholic church in Scottsdale, Arizona.

During a podcast this year, Kirk told a caller: “Catholics are just fabulous in so many different ways.”

“They fight for life, they fight for marriage, they fight against transgenderism,” he said.

The caller asked Kirk about Catholic Mariology, an issue where Kirk said he believes Catholics go “too far.” Yet, Kirk said he would be “happy to debate it” and that evangelicals could “do a better job of remembering, studying, talking about and pointing towards Mary because she was a vessel chosen by God Almighty that brought Our Lord into this world.”

“We as Protestants, evangelicals, under-venerate Mary,” he said. “She was very important. She was a vessel for Our Lord and Savior. I think that we … overcorrected. We don’t talk about Mary enough, we don’t venerate her enough. Mary was clearly important to early Christians. There’s something there. In fact, I believe one of the ways that we fix toxic feminism in America is: Mary is the solution.”

Kirk also spoke about the trend that “many young men are going back to church” when he was interviewed by Tucker Carlson this year. He called church a “life raft in this tsunami of chaos and disorder” and noted that many are attending Catholic Mass because “they want something that has lasted” and “they want something that is ancient and beautiful.”

Vice President JD Vance, a Catholic, posted on X that Kirk “genuinely believed in and loved Jesus Christ” and “had a profound faith.” Vance noted that Kirk was a friend, and they would often debate theological subjects.

“We used to argue about Catholicism and Protestantism and who was right about minor doctrinal questions,” he said. “Because he loved God, he wanted to understand him.”

Diocese of Winona-Rochester, Minnesota, Bishop Robert Barron posted on X that he had breakfast with Kirk about four years ago and discussed theology. Kirk was scheduled to appear on his show “Bishop Barron Presents” in less than two weeks.

“He was indeed a great debater and also one of the best advocates in our country for civil discourse, but he was, first and last, a passionate Christian,” Barron said.

“In fact, when we had that breakfast in Phoenix, we didn’t talk much about politics,” Barron said. “We talked about theology, in which he had a deep interest, and about Christ. I know I’m joining millions of people around the world in praying that he rests now in the peace of the Lord.”

Kirk also joined in grieving for the victims of the Annunciation Catholic Church shooting last month in Minneapolis. On his show, he discussed how one can believe in God even amid tragedy.

“The cross is God’s answer to evil,” Kirk said. “… The question should not be ‘why does evil exist?’ Instead, it should be ‘what has God done about it?’ And the cross is the answer.”