sorry, but your statement is very, very wrong, from wikipedia (but you can check elsewhere):
Lambert (2003) has examined the religious affiliations and beliefs of the Founders. Of the 55 delegates to the 1787 Constitutional Convention, 49 were Protestants, and three were Roman Catholics (C. Carroll, D. Carroll, and Fitzsimons).Among the Protestant delegates to the Constitutional Convention, 28 were Church of England eight were Presbyterians, seven were Congregationalists, two were Lutherans, two were Dutch Reformed, and two were Methodists.
Yes, and let’s keep in mind that three out of fifty-five may not seem like much, but it is HIGHER than the Catholic portion of the colonial population (~4%).
Oops! Turns out only 1.2%, not 4% of the colonists were Catholic. So that three signers were Catholic is quite something.
(Wikipedia, citing Middleton, 225. Also see Michael Lee Lanning, The American Revolution 100 (Napierville:Ill.: Sourcebook,Inc.), 193.)
I’d also consider it of quite significance that John Carroll was promptly made the Archbishop of Baltimore, despite being from a religious order, and a suppressed on at that! (Normally, diocesan priests are chosen to head dioceses; religious order priests are chosen to head only religious ordinariates, although there are many exceptions, like the Franciscan Cardinal O’Malley of Boston.) That the other priests in America nearly unanimously chose him as their leader, and had their selection approved by the Vatican, and that the Vatican immediately established an archdiocese in the newly formed states can only be read as an enthusiastic approval of Carroll’s actions in the states.
And not to little cost! Catholic France’s support of the American Revolution (admittedly, not stemming from the French king’s fondness for Catholicism) cost dearly; the largest Catholic kingdom at that time was plunged into a horrifying Reign of Terror by the anti-clerical French Revolution.
http://www.catholichistory.net/Spotlights/SpotlightFounding.htm
Considering that there was a low population of Catholics in the colonies, Catholics did a pretty good job in helping the American cause.