Here's what Obama said last summer at the "Call to Renewal" conference.
...given the increasing diversity of America's population, the dangers of sectarianism have never been greater. Whatever we once were, we are no longer just a Christian nation; we are also a Jewish nation, a Muslim nation, a Buddhist nation, a Hindu nation, and a nation of nonbelievers.
And even if we did have only Christians in our midst, if we expelled every non-Christian from the United States of America, whose Christianity would we teach in the schools? Would we go with James Dobson's, or Al Sharpton's? Which passages of Scripture should guide our public policy? Should we go with Leviticus, which suggests slavery is ok and that eating shellfish is abomination? How about Deuteronomy, which suggests stoning your child if he strays from the faith? Or should we just stick to the Sermon on the Mount - a passage that is so radical that it's doubtful that our own Defense Department would survive its application? So before we get carried away, let's read our bibles. Folks haven't been reading their bibles. ...
Democracy demands that the religiously motivated translate their concerns into universal, rather than religion-specific, values.
...let me give you an example.
We all know the story of Abraham and Isaac. Abraham is ordered by God to offer up his only son, and without argument, he takes Isaac to the mountaintop, binds him to an altar, and raises his knife, prepared to act as God has commanded.
Of course, in the end God sends down an angel to intercede at the very last minute, and Abraham passes God's test of devotion.
But it's fair to say that if any of us leaving this church saw Abraham on a roof of a building raising his knife, we would, at the very least, call the police and expect the Department of Children and Family Services to take Isaac away from Abraham. We would do so because we do not hear what Abraham hears, do not see what Abraham sees, true as those experiences may be. So the best we can do is act in accordance with those things that we all see, and that we all hear, be it common laws or basic reason.