15:4 When they had come to Jerusalem, 
they were received by the assembly and the apostles and the elders,
and they reported all things that God had done with them. 
15:5 But some of the sect of the Pharisees who believed rose up, saying, 
"It is necessary to circumcise them, and to charge them to keep the law of Moses." 
15:6 The apostles and the elders were gathered together to see about this matter. 
15:7 When there had been much discussion, Peter rose up and said to them, 

"Brothers, you know that a good while ago God made choice among you,
that by my mouth the Gentiles should hear the word of the gospel, and believe. 
15:8 God, who knows the heart, testified about them, 
giving them the Holy Spirit, just like he did to us. 
15:9 He made no distinction between us and them, cleansing their hearts by faith. 
15:10 Now therefore why do you tempt God, 
that you should put a yoke on the neck of the disciples
which neither our fathers nor we were able to bear? 
15:11 But we believe that we are saved through the grace of the Lord Jesus,
{TR adds "Christ"} just as they are." 

"Brothers, listen to me. 
15:14 Simeon has reported how God first visited the Gentiles
, to take out of them a people for his name. 
15:15 This agrees with the words of the prophets. As it is written, 
15:16 'After these things I will return. I
will again build the tent of David, which has fallen.
I will again build its ruins. I will set it up, 
15:17 That the rest of men may seek after the Lord; 
All the Gentiles who are called by my name, 
Says the Lord, who does all these things. (Amos 9:11,12)
15:18 All his works are known to God from eternity.' 
15:19 "Therefore my judgment is that we don't trouble those 
from among the Gentiles who turn to God, 
15:20 but that we write to them that they abstain from the pollution of idols, 
from sexual immorality, from what is strangled, and from blood. 
15:21 For Moses from generations of old has in every city those who preach him, 
being read in the synagogues every Sabbath."  

vs 5 Luke writing in an historic sense speaks of these Pharisees as "believers" referring simply to their association with the Christian community. But Paul writes of this incident in Galatians 2 saying

"Yet not even Titus, who was with me, was compelled to be circumcised, even though he was a Greek. This matter arose because some false brothers had infiltrated our ranks to spy on the freedom we have in Christ Jesus and to make us slaves. We did not give in to them for a moment, so that the truth of the gospel might remain with you."Gal 2:3-5

The church of Jerusalem had false brethren infiltrating the ranks whose objective was to change the gospel so as to bring the Christian community under the bondage of the Law as they saw it. And there are many such people even today in the Christian community. What I find interesting is that the leaders of that church - James, Peter and John apparently were either unaware such infiltration was going on, or simply not willing to deal with it until Paul has to finally come to deal with it himself. Such false brothers would certainly not have been tolerated as far as Paul was concerned. The weakness of the leaders of the Jerusalem church was again evident in Galatians as Paul rebukes Peter.

"When Peter came to Antioch, I opposed him to his face, because he was clearly in the wrong.  Before certain men came from James, he used to eat with the Gentiles. But when they arrived, he began to draw back and separate himself from the Gentiles because he was afraid of those who belonged to the circumcision group." Gal 2:11,12

vs 7-11 Peter makes reference to Acts 10 in which he preaches to Cornelius, a Roman centurion. This dispute should have been put to rest long before when Cornelius was converted. For I don't perceived that he was required to be circumcised after his conversion. In fact I wonder what happened to him. For though living in Israel it doesn't appear that he being uncircumcised would be welcomed into the church at Jerusalem. Furthermore despite Peter defending Paul on the matter, we can see an "us" versus "them" mentality when he speaks of Gentile believers, except for in verse 10 when he simply refers to them as "disciples". I wonder if in reality Peter was not as prejudice as he appeared, but rather was simply using figures of speech acceptable to the racist Jews.

Peter's Argument:
Verse 10-11 is the crux of Peter's argument declaring that their proposition is not consistent with what God has revealed and that they are burdening the church with their human dogma. For salvation is not dependent upon rituals, but upon the grace of God.

vs 12 Paul & Barnabus' Affirmation:
Just as the miracles done by Paul and Barnabus had affirmed to the Gentiles that they were speaking for God. So also this same evidence can be used to affirm their doctrine of salvation by grace against the cult of the circumcision. 

vs 13-21 James's Argument:
James references the Scriptures, affirming that this turning of the Gentiles to God is consistent with prophecy. Implicit in his reasoning is that the scriptures don't refer to Gentiles becoming Jews, but rather Gentiles as Gentiles worshipping God.

vs 16 James references the prophet Amos. The prophecy was given before Israel's Assyrian captivity. One might view the literal fulfillment took place when Zerubbabel returned from captivity to rebuild the temple in accordance with the commission of Cyrus King of Persia. The restoration of Israel to the promise land prepared an environment in which the Messiah would come. Having come he established his people and now the he was drawing the Gentiles to God. Or viewing it more spiritually one might say that the rebuilding of the tabernacle of David was the building of the Christian church into which Gentiles had now been introduced. The gist of this is that God is doing a work as was foretold and let's not interfere.

vs 19-20 This is the origin of Catholicism. Peter had noted that justification by law was too difficult to attain, even for Jews, and thus salvation is by grace apart from Law. Peter agreed with Paul. James did not. Instead, rather than abandon the Law as a means for justification, James picked up on what Peter said about the Law being too difficult to follow and what James did was to cherry pick from the law and made salvation contingent upon his arbitrary cherry picked regulations so to make it easier for Gentiles  to be saved through law, just as Catholics do with regards to their Canon Law which they develop through their Vatican councils. In fact Catholic theologians reference this event in Acts to justify their tinkering with the Gospel.

 James made salvation contingent upon the follow.

• abstain from food polluted by idols, 
• from sexual immorality, 
• from the meat of strangled animals 
• and from blood.

What arrogance this man had to say, "It is my judgment, therefore, that we should not make it difficult ..." Who the hell do you think you are to tinker with the gospel? Jesus made the gospel. Who are you to suggest it be remade in your image.

Now if this was the regulations he imposed on the Gentiles, then what of the Jews? There's little doubt in my mind that the James thought justification for the Jews was by the Law of Moses and that James himself was involved with the cult of  the circumcision, who even held positions of leadership in the church at Jerusalem who declared as verse 5 indicates, "The Gentiles must be circumcised and required to obey the law of Moses." It's like James is saying that Jews must be circumcised and follow the Law of Moses to be saved, but we'll make it easier on Gentiles by just making their salvation contingent upon compliance to certain regulations, like not eating meat of strangled animals.

Jesus nullified the dietary commandments in Peter's vision which was in reference to Gentile believers, commanding "Do not call anything impure that God has made clean." Acts 10:15 Although not explicitly referring to meats sacrificed to idols, strangled animals, and blood. But the principle applies. For Paul goes on to write:  "As one who is in the Lord Jesus, I am fully convinced that no food is unclean in itself. But if anyone regards something as unclean, then for him it is unclean." Romans 14:14