Why should anyone refute? No one is disputing the faith of any founders. These men (and all men and women in the USA) are (and should) be free to express their religious beliefs in letters to their sons, conversations with coworkers, whatever. Precisely the fact that - in spite of all their talk of God in their personal writings, and even at the constitutional convention - God and Jesus are not mentioned in the Constitution makes a GIGANTIC point doesn't it?

Is there any reason why religious people (off whatever religion) can't found a completely secular institution?