After his marriage, George Washington, like his father before him, served for a considerable time as vestryman in Truro parish. Later he served in the same capacity in Fairfax parish. He is recorded as having served on the building committees of Falls Church and Pohick Church–the latter edifice, being built from plans which he drew,7 still stands today. Davis

And he wasn’t glad for religious freedom because he wasn’t a believer.

After the Colonies had won their independence, it was a matter of special pride to Washington that the American Republic guaranteed full religions liberty to all, especially to such persecuted groups as the Jews and the Quakers. In a famous letter to the Hebrew congregation at Newport, Rhode Island, in August 1790, he wrote:

It is now no more that toleration is spoken of, as if it was by the indulgence of one class of people that another enjoyed the exercise of their inherent natural rights. For happily the Government of the United States, which gives to bigotry no sanction, to persecution no assistance, requires only that those who live under its protection should demean themselves as good citizens, in giving it, on all occasions, their effectual support. . . . May the Father of Mercies scatter light and not darkness on our paths, and make us all, in our several vocations useful here, and in his own due time and way everlastingly happy.12

In similar vein he wrote to the Philadelphia Quakers:

The liberty enjoyed by the People of these States, of worshipping Almighty God agreeable to their consciences is not only among the choicest of their blessings but also of their rights. . . . I assure you very explicitly that in my opinion the conscientious scruples of all men should be treated with delicacy and tenderness.13 Davis

He resigned from Commander in Chief, stating:

I consider it an indispensable duty to close this last solemn act of my official life, by commending the Interests of our dearest country to the protection of Almighty God, and those who have the superintendence of them to his holy keeping.

All of the above is from here. As you can tell from the numbers in places, he does give a bibliography from which you can trace his quotes.

Some of these quotes I found used on other pages on the internet, but I found them at the above site first.