Obey the word of the Lord

Acts 15:12-21
James  spoke up: The words of the prophets are in agreement with this, as it is written by Amos 9:11,12. That the remnant of men may seek the Lord, and all the Gentiles who bear my name says the Lord, who does these things. Gentiles is nations in Amos.
And James make judgment, therefore, that we should not make it difficult for the gentiles who are turning to God.
Write to them to abstain from food polluted by idols, from sexual immorality, from the meat of strangled animals and from blood.
The final summing-up and verdict given by James, the Lord's brother and leader of the Jerusalem church, finds general acceptance. The Gentiles are asked simply to accommodate the Jewish Christians by respecting Jewish food-laws, so that Jews and Gentiles can share the same table and the church meet together as one.
This chapter is a turning-point in Acts. The center now shifts away from Jerusalem and the apostles, with the emphasis on the mission to the Gentiles, and the new churches.
Why?
James used Amos's words proved that God says that Gentiles bear his name. And all the wonder and many miraculous signs are happened as in Jews. So they have not right to reject the way of the Lord.
According to the word of the Lord to make decision is correct way to resolve troubles in church.
How?
Obey to the words of the Lord and subdue to the authority of the Lord.