The committee responsible for writing the Constitution:
James Madison - nominally deist, but apparently had very little interest in religion or spirituality
Thomas Jefferson - deist, but faithful, and approved of Christianity
John Adams - a lot of deist beliefs, but remained a practicing Christian with faith in a Christian God and probably trinity
John Dickinson - Christian (Quaker)
Gouverneur Morris (chair) - deist
Thomas Paine - deist, and vocally and in written documents expressly opposed to Christianity
James Wilson - Christian (Presbyternian)
George Wythe - Christian (Episcopalian, Quaker background)
Edmund Randolph - nominally Episcopalian, but with Deist leanings
Roger Sherman - devout Congregationalist
So of the 10 writers, 4 were truly Christian to the extent that it would seem likely to influence their sociopolitical beliefs. Of the 4, Sherman was far most significant in terms of his role in actually writing the Constitution. While Morris probably wrote the preamble, Sherman and Adams are thought to form the next tier after Madison in terms of writing the actual document. Dickinson was also important. Wilson and Wythe were involved in the structure of parts of Articles 3 - 6, as both were experts on jurisprudence.
It is worth pointing out that Paine, the only member of the committee who openly disapproved of Christianity and organized religion in general, had very little voice in the actual writing process.