Usually Deist, but there are other less popular forms of Christianity that Orthodox and Heterodox folks would both probably label as heresy. For instance the "Paradox" Christians, who often cite Paul in Romans 7:
“For I do not understand my own actions. For I do not do what I want, but I do the very thing I hate.”
And those who practice Christianity as a life-philosophy without what they regard as childish superstitions. To a degree, that was Einstein's view, and also Thomas Jefferson's view. Einstein professed a belief in the "God of Spinoza" many times, but also said:
The word God is for me nothing more than the expression and product of human weaknesses, the Bible a collection of honorable, but still primitive legends which are nevertheless pretty childish."
Thomas Jefferson wrote one book in his life- and I'm not including his penchant for cutting up Bibles and re-assembling them into stories about Jesus as "authoring a book". (only one of those survived, which is what people mean by "Thomas Jefferson's Bible".)
Anyway, in the book that he wrote, he describes the sublime geology of a land that he visited- I believe in America- and specifically alludes to the idea that it must have taken a long time for the features of that land to form. I think this contradicted the understanding of most Christians at the time- who believed that the world was 6000-10000 years old, or was created in 7 "normal days" - with the mountains and oceans sort of plopped down as they are now instead of carved by natural forces, such as the earth's mantle crumpling up near the tectonic plates.
(He was absolutely correct- I mean at least if you aren't a young-earth creationist. Who I think believe that dinosaur bones were placed in the earth by God in order specifically to deceive us and send as many people as possible to Hell.)
In any case, he was called an atheist because of those implications, and lost so much political capital that he faced what may have been a very real threat of being burnt alive at the stake by Puritans who escaped Europe and England to avoid that sort of thing. (Some history sites like Encyclopedia Britannica say that is a false narrative, and that the early Americans largely just hated British and European life because it was too city-like, with not enough open space, and making money was too hard.) Regardless, his Christianity had been questioned, and he had to prove himself in the eyes of many of his peers again. I am guessing this is why he kept his "Bible clipping projects" secret.
I've read alot of discussions of what his faith would best be labeled as, and there are actually good arguments for about 3 o 4 different answers- probably the most convincing argument for Deist, but others had decent evidence (like letters he wrote, that he probably thought would have been kept private) supporting them.
I think Deism is under-rated, because it can be used as a way to get atheists and agnostics interested in Jesus without making "wild claims" about Jesus being Divine, or God - and instead "just" the most wise and moral human ever to have lived.
Sorry about the long answer. I'm new here. :)