Of the 45 delegates to the continental congress, only two (Benjamin Franklin and another) were known to be deists. One's membership records couldn't be found. The other 42 were active members and on the books in their churches.[0]

Jefferson also was a deist, but he wasn't present at the constitutional convention of 1787 (though he earlier authored the Declaration of Independence).

[0] M. E. Bradford. Founding Fathers: Brief Lives of the Framers of the United States Constitution, second edition. University Press of Kansas, 1994.

typo - *55 delegates attended the constitutional congress, 52 of which were on the church registers as active church members.

note: only 39 delegates signed the resulting document