They all started out in the church following all the laws...And there wasn't a clear statement on revoking the law until Romans 3...
Error had crept in the Jerusalem church as they incorporated more Jews especially some Pharisees. Some may have been practicing some of the old ways but none of he apostles were preaching them as a way to salvation or a requirement.
I don't think it was error...Bible says it was fear...Seems as Peter was well outnumbered by the Jewish Christians and he lacked the courage to stand up to them to tell them the truth...He was in great fear...And Barnabas became gripped with the same fear...
It WAS fear..remember when Peter was given the vision to go to Cornelius? “But Peter REHEARSED the matter from the beginning..” (Acts 11:4), and also Acts(11:17): “Forasmuch then as GOd gave them the like gift as he did unto us, who believed on the Lord Jesus Christ: what was I, that I could withstand God?”
Ah, this dives into the middle of a whole ‘nother controversy.
It would be well to look for broad, overarching premises that make sense. Then that will put the details into their proper place.
I’ve seen so many preachers fall into worldly modes of expounding gospel and bible. That fails to directly edify, though in God’s economy where nothing is entirely wasted, it can prove part of a trial that will help educate a soul. By means of following wrong paths for a limited time and seeing the consequences, a soul will be educated to seek right paths instead, as God also fills that soul with more and more courage and love.
It’s possible to fall out of a walk in the short view and still not be out of the overall march in the long view. And the less time that the person who fell spends worrying about what a burden his fall put upon his status as a believer, the quicker that person will recover. Satan may seem ferocious to us, but he is a paper tiger in God’s eyes. God will even turn Satan’s works to our good. It is given to us a range of choice as to how slow or quickly to respond to the Lord.