Louie Gohmert tells the Supreme Court: Jesus’ law more important than constitutional law

But Louie, it is not just Moses that is depicted in or on (the East Pediment) the building that occupies 1 First Street, Northeast, Washington, D.C.. You seem to leave out of your narrative that Moses is not given any special emphasis in the numerous depictions:  his figure is not larger than the others;  he is not displaying any type of dominance over the other figures; nor is the Decalogue (a hotly contested notion at best) written in full.  " Over time, the use of two tablets has become a symbol for the Commandments, and more generally, ancient laws. Tablets signify the permanence of the law when “written in stone.”

Specifically in the frieze mentioned, Moses is holding two tablets (let's assume the Ten Commandments),but only commandments six through ten are visible usually considered the more secular of commands.  That would fit with Weinman's design for said frieze,

Weinman’s training emphasized a correlation between the sculptural subject and the function of the building. Gilbert relied on him to choose the subjects and figures that best reflected the function of the Supreme Court Building. Faithful to classical sources and drawing from many civilizations, Weinman designed a procession of “great lawgivers of history” for the south and north walls to portray the development of law. Each frieze in the Courtroom measures 40 feet long by 7 feet, 2 inches high and is made of ivory vein Spanish marble

And, no Louie Christ did not define marriage between one man and one woman.

“It is a matter of a constitutional crisis when the Highest Court in the land not merely strikes down and says that their opinion is more important than Moses’, depicted up there in the center point of this room, more important than Moses’, depicted in the marble wall over the Supreme Court, holding the Ten Commandments,” the congressman said on the House floor.

“The Supreme Court says theirs is more important than the opinions established and stated by Jesus Christ when he said–and he was quoting Moses–that a man shall leave his mother and father, a woman leave her home, and the two will come together and be one flesh, and what God has joined together, let no man put asunder.”

  “The Senators and Representatives before mentioned, and the Members of the several State Legislatures, and all executive and judicial Officers, both of the United States and of the several States, shall be bound by Oath or Affirmation, to support this Constitution; but no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States.”
— U.S. Constitution, Article VI, clause 3

Louie Gohmert tells the Supreme Court: Jesus’ law more important than constitutional law