Donald TrumpDonald TrumpMajority of Americans in new poll say it would be bad for the country if Trump ran in 2024 ,800 bottle of whiskey given to Pompeo by Japan is missing Liz Cheney says her father is 'deeply troubled' about the state of the Republican Party MORE slammed fellow 2016 Republican presidential candidate Ben CarsonBen CarsonSunday shows preview: Delta concerns prompt CDC mask update; bipartisan infrastructure bill to face challenges in Senate Government indoctrination, whether 'critical' or 'patriotic,' is wrong Noem takes pledge to restore 'patriotic education' in schools MORE for questioning his faith, calling the retired pediatric neurosurgeon an "OK doctor" who was "heavy into the world of abortion."

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“Who is he to question my faith?” Trump asked host Chris Cuomo on CNN’s “New Day.” “He knows nothing about me.

“I am a man of faith,” he continued. “I hardly know Ben Carson. I’m a believer, big league in God. I will hit back on that.

“I don’t think he’s a great religious figure,” Trump added. “If you look at his faith, you’re not going to make it very far.” 

Trump argued on Thursday that Carson’s medical background undermines his claims about his spiritual convictions.

“He was an OK doctor,” he said. “He was heavy into the world of abortion.”

Carson questioned the sincerity of Trump’s spirituality during an interview on Wednesday evening.

“I realize where my successes come from, and I don’t in any way deny my faith in God,” he told listeners during a campaign rally in Anaheim, Calif.

“I think that’s the big differentiator,” Carson added, comparing himself to Trump.

“That’s a very big part of who I am — humility and fear of the Lord. I don’t get that impression from him.”

“When Ben Carson makes a phony statement, I am going to attack him.” Trump said on Thursday. “Ben Carson is not going to be the next president, that I can tell you.

“He makes Bush look like the energizer bunny,” he added, taunting Carson’s soft-spoken persona and former Gov. Jeb Bush (R-Fla.), another GOP presidential rival, at the same time.

Trump’s war of words with Carson comes as he leads the retired doctor and other Republicans in the race for their party’s presidential nomination next year. 

Carson currently ranks second place after Trump in the hunt for next year’s Republican presidential nomination across multiple national polls.

The real estate tycoon earns 29.8 percent to Carson’s 16 percent voter support, according to the latest RealClearPolitics average of samplings.

--This report was updated at 8:22 a.m.