Now, you might have a difficult time trying to prove what I really believe or my true intentions, since those are internal thoughts and we can't exactly prove what people feel and think, yet. However, saying that, I don't have to accept anything the founding fathers said as true, since there is no way to go back in time and even know how each of them lived their lives. We can't know how any of them truly felt about God or if they were just pandering. They can believe that they were inspired by God and that God set forth certain inalienable rights, but it doesn't make it true.
In fact, since those "inalienable rights" have been expanded to other people, then what is the explaination for God inspiring them to give certain inalienable rights to some but then waiting so long to inspire others to give those same rights to people that didn't fit in during that time?