Quote from said speech:
"The diversity of our cultural expression, and the vibrancy of our religious dialogue, has kept America in the forefront of civilized nations even as others regard religious freedom as something to be destroyed.
"In such a world, we can be deeply thankful that we live in a land where reason and religion are friends and allies in the cause of liberty, joined against the evils and dangers of the day. And you can be certain of this: Any believer in religious freedom, any person who has knelt in prayer to the Almighty, has a friend and ally in me. And so it is for hundreds of millions of our countrymen: we do not insist on a single strain of religion - rather, we welcome our nation's symphony of faith."
From my early skimmings of what he said, I think Romney hit the nail on the head. By coming out and asking why certain individuals are basically proposing we do away with the "no religious test" rule, he took the fight to the other side.
Link to the video of the speech
Full text of speech
More to come.