If a messianic Jew obtains great joy by celebrating the Jewish Holy days and feasts is it permissible for me, a gentile, to do the same? If one’s ethnicity is the deciding factor then has the wall of separation between Jew and gentile truly been torn down?
In my experience, studying the feast days and ceremonies of the Mosaic covenant and learning how they point to the person and work of Christ is, in and of itself, an enriching endeavor. However, whenever I've felt the urge to actually attend an authentic passover seder or other Jewish holiday (uncommon though this desire is), I am reminded of Hebrews 10:1-18, which makes clear that Christians, having obtained the substance of all the Old Testament promises, no longer have need to resort to those means whereby God was pleased to bless His people in times past, except perhaps by way of reminder. Indeed, the epistle to the Hebrews itself is an exhortation to Jewish converts to remain steadfast in their profession of faith and the comparative simplicity of Christian worship, and not be lured back into the elaborate, ritualistic, performative system of Second Temple Judaism.
The only way in which I can see a present Christian observing such days as 'holy' would be in the context of evangelism, as Paul so regulated his conduct among the Jews as to not give the appearance of validating rumors that he and the other disciples blasphemed against Moses and the law (see Acts 6:8-14 and Acts 21:17-29 on this point). I'm certain that some missionaries who frequent this board can testify to the reality of having to 'bear with the weaknesses' of those long accustomed to a former manner of living, especially in pagan lands. Christ Himself condescended out of love for His people, so we as His ministers ought to act in like manner (Romans 15:1-3) and take to heart the words of the blessed apostle:
"For being free from all, I myself became servant to all, so that I might win the more. And to the Jews I became like a Jew, so that I might win
the Jews. To those under
the Law, as under
the Law (myself not being under
the Law) so that I might win those under
the Law. To those outside
the Law, as outside
the Law (not being outside
the law of God, but under
the law of Christ) so that I might win those outside
the Law. To the weak I became weak, that I might win the weak. I have become all these things to all, so that by all means I might save some.Now I do all
things on account of the gospel, that I might become a fellow partaker with it." 1 Corinthians 9:19-23