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Adams and Jefferson must have known him, and Jackson must have seen in him a flaming spirit as unconquerable as his own ...

Adams was raised a Congregationalist, but ultimately rejected many fundamental doctrines of conventional Christianity, such as the Trinity and the divinity of Jesus, becoming a Unitarian. In his youth, Adams' father urged him to become a minister, but Adams refused, considering the practice of law to be a more noble calling. Although he once referred to himself as a "church going animal," Adams' view of religion overall was rather ambivalent: He recognized the abuses, large and small, that religious belief lends itself to, but he also believed that religion could be a force for good in individual lives and in society at large. His extensive reading (especially in the classics), led him to believe that this view applied not only to Christianity, but to all religions.

https://www.god-and-country.info/JohnAdams.html

The religious views of Thomas Jefferson diverged widely from the traditional Christianity of his era. Throughout his life, Jefferson was intensely interested in theology, religious studies, and morality.[1][2] Jefferson was most comfortable with Deism, rational religion, Theistic rationalism, and Unitarianism.[3] He was sympathetic to and in general agreement with the moral precepts of Christianity.[4] He considered the teachings of Jesus as having "the most sublime and benevolent code of morals which has ever been offered to man,"[5] yet he held that the pure teachings of Jesus appeared to have been appropriated by some of Jesus' early followers, resulting in a Bible that contained both "diamonds" of wisdom and the "dung" of ancient political agendas.[6]

https://en.wikipedia.org/wiki/Religious_views_of_Thomas_Jefferson

Jackson was brought up in a Presbyterian family. Although he had little interest in religion early on, Jackson became increasingly religious, eventually joining the Presbyterian church in 1838.

https://www.god-and-country.info/AJackson.html