According to Rom. 13:1-10, every government on earth has a moral obligation to enforce, to a point, the 2nd table of the Decalog. Since no man can read the heart, the government's obligations extend only to actions, not thoughts. The enforcement of the 1st table of the Decalog is off limits.
I realize that it is the papacy, not the U.S., that has altered the 4th commandment. But this flippant disregard of the 7th which is so rampant among so much of society, regardless of "orientation," demonstrates an attitude that invites divine judgments.
Sure, we can use secular arguments for opposing gay marriage, but doing so brings us down to the level of having to pit reason against reason. Our strongest weapon is the sword of the Spirit, and God has declared in no uncertain terms that the governments of earth are supposed to enforce (to a point) the 2nd table, not override it.
When the president and the courts and the legislatures get to the point that they think so much of themselves, are on that big of an ego trip, that they think they can override explicit commands of God regarding marriage, enforcing Sunday rest in violation of the 4th commandment isn't that big of a step further.
The president swore on two Bibles, cited the Declaration of Independence regarding God creating us, called freedom a "God-given promise," referred to "God's grace upon us," invoked God's blessing, and cited "the words of Scripture." At the same time he had the audacity to call on the entire country to repudiate what God has said in Scripture about the iniquity of homosexual practices.
He spoke either out of ignorance or out of presumptuous rebellion. Are there other possibilities?