You mean all two of them?
No, dear. I mean all those signers of the constitution who rejected religious (christian) totalitarianism as a part of the formulation of the constitution.
It was these gods fearing Christians with enough wisdom to understand that religion and totalitarianism are inseparable. The framers of the constitution had direct experience with the conditions in the original 13 colonies wherein the various sects, subsects and subdivisions of Christianity were at odds with one-another. In many respects, the original colonialists were models of Christian hate, intolerance and religious divisions.
For that matter, to broadly define the signers of the constitution as Christian is a rather sweeping generalization. They would be better served by defining their specific version of Christianity as the sects, subsects and subdivisions of that religion are still at odds with one-another.
The framers of the constitution knew all too well the totalitarian nature of Christianity (and of all religions), which is why they specifically designed a constitution that forbid the government from endorsing or favoring any one religion and more importantly, required the government to be removed from decision making in ones personal choice of religion or no religion.