Former Illinois Rep. Adam Kinzinger said Tuesday that Christians who support former President Donald Trump don't understand their own religion.

Kinzinger made the comment in a social media post in which he shared a screenshot of a statement Trump wrote on Truth Social, the former president's own social platform. Trump wished a Merry Christmas to "Crooked Joe Biden" and "Deranged Jack Smith," along with wishing all the "thugs" in the United States to "rot in Hell," a dig at various lawmakers in the United States.

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"I’m going to go out on a NOT limb here: this man is not a Christian," Kinzinger wrote on social media. "If you are a Christian who supports him you don’t understand your own religion. Trump is weak, meager, smelly, victim-ey, belly-achey, but he ain’t a Christian and he’s not 'Gods man.'"

Kinzinger's comment is one of many he has made criticizing the former president. He was one of 10 Republicans to vote to impeach Trump in the wake of the Jan. 6 Capitol riot, and he also worked on the Jan. 6 committee, which investigated the events of that day and held public prime-time hearings with key witness testimony.

The former Illinois lawmaker opted not to run for reelection for his House seat in the 2022 midterm elections, ending his 12-year tenure in Congress. Shortly after leaving, Kinzinger joined CNN as a senior political commentator.

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Last month, Kinzinger, who has since moved to Texas, said he would "love to run" against Sen. Ted Cruz (R-TX), calling him "the most complete con artist in politics." However, he said he would not seek such a run for office in 2024 when Cruz will campaign for a third term in the Senate.

"I've got a young kid," Kinzinger said. "I've got to kind of come down from the last couple of years. But if there's a moment that comes along and the timing is right, yeah, absolutely."