Very well. Let's take a look at the council then, shall we? Here is a link to Acts 15. I won't quote it all here, because it is long, but I will refer to portions of it.
Acts 15 NIV
First, we have in verse 5, a pharisee convert who claims that all gentile converts must be circumcised. That is certainly an interesting idea, I wonder where he came up with it? Well, from scripture, of course, as seen here:
9Then God said to Abraham, As for you, you must keep my covenant, you and your descendants after you for the generations to come.
10This is my covenant with you and your descendants after you, the covenant you are to keep: Every male among you shall be circumcised.
11You are to undergo circumcision, and it will be the sign of the covenant between me and you.
12For the generations to come every male among you who is eight days old must be circumcised, including those born in your household or bought with money from a foreignerthose who are not your offspring.
13Whether born in your household or bought with your money, they must be circumcised. My covenant in your flesh is to be an everlasting covenant.
14Any uncircumcised male, who has not been circumcised in the flesh, will be cut off from his people; he has broken my covenant.
In fact, if you go through the entire OT, you will find that circumcision is indeed binding for all jews, who were considered the people of God. There is no verses that would lead anyone to think otherwise. Therefore, by using sola scriptura (as the pharisee did here) one would logically be led to believe that gentile converts must (and should) be circumcised. Why shouldn't it say that? The OT said nothing about Christian converts. There simply was no 'standard' or 'precedent' for them to abide by. So therefore, the pharisee was justified, at least in the eyes of sola scriptura, to demand that the gentiles be circumcised.
Wait though, didn't James use scripture as well? Why yes he did, as we see here:
16After this I will return
and rebuild Davids fallen tent.
Its ruins I will rebuild,
and I will restore it,
17that the remnant of men may seek the Lord,
and all the Gentiles who bear my name,
says the Lord, who does these things
b
18that have been known for ages.
c
However, this verse says nothing about gentile converts to Christianity, nor does it say whether they should obey the Laws of Moses or the covenant of old. James was simply asserting here by using scriptural support, that gentiles are now to be welcomed to be people of God as well as jews. (Using scriptural support is nothing new in councils, all decisions use scripture to support their decisions, however the key difference is that they do not use ONLY scripture). Notice also that Paul believed that converts do not need to be circumcised, while James originally believed they should be. If scripture was their only source for formulating doctrine here, then why didn't they agree with each other? Clearly because there was no biblical precedent for such a case.
So here we have the decision of James:
19It is my judgment, therefore, that we should not make it difficult for the Gentiles who are turning to God.
20Instead we should write to them, telling them to abstain from food polluted by idols, from sexual immorality, from the meat of strangled animals and from blood.
21For Moses has been preached in every city from the earliest times and is read in the synagogues on every Sabbath.
Interesting decision. He decides (no doubt after consulting with the others) that the gentiles should obey
some of the laws of moses, which does
not include circumcision. Was this decision made relying entirely upon scripture? Of course not! I challenge you to find anywhere in the OT where such a rule for converts, or anything remotely like it, is laid out. It is simply 'not written'. Again, if they were to follow scripture alone, they would no doubt conclude that the converts should obey the laws and be circumcised, as the pharisee stated, because that was the rule for the jews, who were God's people. As you can see, the verse that James quotes says
nothing about this decision or the details which are contained within. All it suggests is that God will come for the gentiles as well. He used scripture to support his decision, but in no way did he use scripture alone while formulating it (again, how could he when there is no such precent established?) To say otherwise is simply ignoring the obvious.
Make no mistake, this was indeed real church doctrine which was established here; this was a big deal. This decision was binding on all local congregations. So what are we to conclude then if scripture alone didn't guide their decision on the formulation of doctrine? Well, simply that the church was guided by the Holy Spirit, and the Holy Spirit is not limited to acting through scripture alone in such matters. To attempt to confine the action of the Holy Spirit is indeed a grave error. We must have faith that the Spirit guided the church leaders faithfully and in the appropriate direction to which he saw fit, the same assumption that we should (and do) make regarding the later universal councils. To assume otherwise is to lose faith that the Holy Spirit is alive, present, and active in the church. It is the holy spirit which ultimately acts, whether he chooses scripture or other means to convey his truths.