I do not believe this is accurate. My understanding is that most of them were deists. "Deism holds that a god must exist, based on the evidence of reason and nature only, not on supernatural evidence. Some deists believe that a god created the world but is indifferent to it. Theism holds that there is one God who is still actively engaged with the universe in some way." https://www.dictionary.com/compare-words/deism-vs-theism#:~:text=Deism%20holds%20that%20a%20god,the%20universe%20in%20some%20way.

"Deism closely resembles theism, but for the deist God is not involved in the world in the same personal way. God has made it, so to speak, or set the laws of it—and to that extent he sustains it in being." https://www.britannica.com/topic/theism

PS: Christianity, and Judaism and Islam, are all theistic religions. https://www.britannica.com/topic/theism