To an extent, but while the Founding Fathers openly promoted tenets of Christianity, in correspondence and at their core were theistic rationalists, which takes a rationalistic approach to Scripture and God overall, concluding that all people can reason towards God while at the same time (for balance) believing all religions are true and compromise the truth. This is the reason the founding fathers are not adherent to the gospel and the life/death/and resurrection of Christ being the way or the only way. The doctrine of hell itself was very unpopular among them because of the exclusivity of one religion over all religions.

Acceptance, approval of worship, and affirming the beliefs of the religions of the world are who they were and the reason freedom of religion exists as it did then and does today. To say the United States is a Christian nation is false. The big picture from 30k is if it were true, we would be obligated to exist and operate as a Christian theocracy. Nothing less would satisfy the meaning and constitution of a religious nation. Muslim nations exist and Islamic nations exist, but Christian nations do not exist. That is the very antithesis of the purpose for founding the United States.