Sabbaths, annual festivals, clean and unclean meats, and clothing stipulations of the Old Covenant caused a division between Israelites and their neighboring nations.
This is clearly what is being spoken of. The Old Covenant is no longer applicable. It served a purpose of division, just like it causes here. Judaizers clearly try to use ceremonial and ritualistic elements of the Law to distance themselves from others as more holy or more obedient or even saved while others are not.
I can show examples of this from New Testament accounts and from the actions of individuals here:
http://christianchat.com/bible-disc...-old-covenant-observance-causes-division.html
I also have evidence of this from my own life as a former Sabbath and festival keeper. No one who failed to keep the Sabbath, holy days, clean and unclean meats, and triple tithing was considered to be saved in our group.
That is why I won't associate with Sabbath or festival keepers anymore. I would have no issue attending a church with such leanings if they weren't judgmental, but invariably they are...and in addition, they don't focus on Jesus Christ and salvation through him. It is all about the need to keep the Old Covenant ceremonial and ritualistic laws.