
At the time of Paul's ministry, Jewish Believers and Gentile Believers were called out of some form of tradition into a new body which is the Church.
If I understand you correctly, you are saying that celebrating Christmas is ok because Paul would have approved of it?
There is no value for me to restate my position that I don't do Christmas because of my believe that it is an amalgamation of pagan\secular traditions and that its institution is of a political necessity rather than an opportunity to preach the gospel. Plainly stated, I don't think Christmas falls under the jurisdiction of the context of what Paul is describing in Romans 14 at all.
Paul was continuesly warning against what was proper and improper behavior being brought into the Church. For instance,
I hope I've made my point clear. If you have any questions, please ask.
Thank you.