[AVNevis]

No, he wasn't wrong. The great majority of Americians and even the more secular countries that copied our constitution still must have some morals for it to be able to work. And more importantly this quote shows Adams believe religion had a place in government, invalidating the Michal Newdows of the world.

[Torie]

our constitution still must have some morals for it to be able to work.

Of course. This may shock you, but many non-religious secular types have morals, and make a priori leaps of faith about certain moral precepts (which cannot be validated on rational self interested prudence alone), even if they don't realize it. I happen to realize it, and admit it.