James says “After this I will return ...”. When did Jesus return????
Amos's prophecy is in the first person singular of YHWH.
Therefore it is improper to insist that the "return" be the "return" of the second person of the Godhead, especially since the first coming had not even been mentioned yet in the verse. As you know, "return" can mean a variety of things in the scriptures. The most obvious is "return to me, and I will return to you." That clearly makes the most sense here, as the obvious meaning in Amos is that God judges, and then returns with his presence and restores. A mark of this restoration is the raising up of the tabernacle of David and the ruling of Israel over the Gentiles. As we have covered about 800 times so far, the plain common sense meaning of the scripture is that James considered this prophecy to be fulfilled in the coming of the Gentiles to faith.
I have no idea how you came up with some second coming of Christ to the earth from this passage. You are REALLLLLLYYY reaching, here. I am still waiting for an explanation of why the church missed this for 1800 years.