Sinister? I meant that it’s odd that they wear something that is a suggested custom..

https://www.chabad.org/library/article_cdo/aid/483387/jewish/Why-Do-We-Wear-a-Kippah.htm

Question: Is the kippah a symbolic reminder intended to prevent assimilation, or is the kippah a biblical obligation, like the tzitzit? Answer: The tradition to wear a kippah is not derived from any biblical passage. Rather, it is a custom which evolved as a sign of our recognition that there is Someone “above” us who watches our every act.

While eschewing the thing that is actually commanded

https://www.biblegateway.com/passage/?search=Numbers%2015%3A37-41&version=TLV

37 Adonai spoke to Moses saying, 38 “Speak to Bnei-Yisrael. Say to them that they are to make for themselves tzitzit on the corners of their garments throughout their generations, and they are to put a blue cord on each tzitzit. [a] 39 It will be your own tzitzit—so whenever you look at them, you will remember all the mitzvot of Adonai and do them and not go spying out after your own hearts and your own eyes, prostituting yourselves

It’s not a command that creates salvation, but a command to help remind us that we are to remain set-apart (“Holy”) and in righteous obedience.

https://biblehub.com/kjv/matthew/5.htm

(Spoken by Jesus)

17 Think not that I am come to destroy the law (“Torah”), or the prophets: I am not come to destroy, but to fulfil. 18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. 19 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.

For what purpose would God abolish a commandment intended to help remind us that we are to remain holy that he said was in place for all our generations, and this after Jesus himself said he did not come to abolish the Torah or the prophets, when we also know one of his primary purposes to be offered as the perfect atoning sacrifice - The Word made flesh, fully innocent, offered to allow us to be brought into reconciliation with The Most High.

Romans 11:17-21

17 And if some of the branches were broken off, and you, being a wild olive tree, were grafted in among them, and with them became a partaker of the root and fatness of the olive tree, 18 do not boast against the branches. But if you do boast, remember that you do not support the root, but the root supports you. 19 You will say then, “Branches were broken off that I might be grafted in.” 20 Well said. Because of unbelief they were broken off, and you stand by faith. Do not be haughty, but fear. 21 For if God did not spare the natural branches, He may not spare you either.

So if Messianic believers in Jesus are grafted in, grafted in to … what? … and that would make them … which would mean …

Something that seems fairly widespread in all three partakers of the Abrahamic covenant is a tendency to stray from scripture and follow dogma and teachings of men. When a potter goes to make a pot from his clay, he doesn’t simply touch the lump of clay and it is instantly transformed into a pot, but he must spin the pot many hundreds of times while very gradually forming it into its final shape. Most of the “New” Testament is simply quoted from the “Old”. Sola scriptura, brother. Blessings!

Edit: while looking these things up, I stumbled onto this article, which I found very interesting https://typesofhats.com/taqiyah-vs-kippah-vs-zucchetto/