1st, Why Ahnsahnghong is the 2nd coming Jesus?

Read the below pls.

Actually, there are lots of prophecies about Christ Ahnsahnghong in the bible.

Isa. 41:2 『"Who has stirred up one from the east, calling him in righteousness to his service? He hands nations over to him and subdues kings before him..."』

The above verse states that God "has stirred up one from the east." Since it is prophesied that kings are subdued before "the one," he must be a man of great power. Then, who is "the one"? If we read the same chapter, beginning in verse four, we can come to know who "the one" is. 

Isa. 41:4 『"Who has done this and carried it through, calling forth the generations from the beginning? I, the LORD—with the first of them and with the last—I am he."』

The one whom God "has stirred up" is God, Himself. This prophecy means that God Himself will come in the flesh, from the east. "The one" who came in fulfillment of this prophecy is God Ahnsahnghong. 

In chapter 46 of the same book, Isaiah, it is written: 

Isa. 46:11 『From the east I summon a bird of prey; from a far-off land, a man to fulfill my purpose. What I have said, that will I bring about; what I have planned, that will I do.』

The prophet Isaiah recorded again about "the one" who would arise from the east, from a far-off land. In the Bible, a bird of prey—or, an eagle—represents God (Deut. 32:11; Ex. 19:4). Since this "bird of prey" coming from the east is described as a man who would fulfill God’s purpose, it is very clear that God, Himself, would come from the east as a man, in the flesh. The one who fulfilled this prophecy is God Ahnsahnghong. 

And there are lots of prophecy about Christ Ahnsahnghong in the bible.
So World Mission Society Church of God blelieves in Christ Ahnsahnghong as God the Father.