What you ignore is there are multiple definitions of the word Jew. You are only looking at the religious definition. It also denotes racial background, that is why Christian Jews refer to themselves as Messianic Jews. Messianic refers to their belief and Jews refers to their racial background.
Your DNA claims about Jews has been explicitly refuted by your own source. To continue making them shows you to be a liar.
You have repeatedly said, "Jews have a Levitical genetic marker [showing them to be a race]." Your source says, "That [levitcal genetic marker] is relatively rare among Ashkenazim without a tradition of Levite descent and still more uncommon among Sephardim (both Levites and non-Levites) [to say nothing of this marker outside of any jewish population]."
You ignore the truth. You ignore God's word.
There's no such thing as Messianic Jew. It's an oxymoron. You ignore what the state of Israel says, too.
The kindest thing I can assume about a "Messianic Jew" is that they keep the word "Jew" as just a cultural, not a racial or religious, reference. But, the Jews believe them all to be liars, and I'm inclined to agree with the Jews.