פרשת חקת- The Biggest question: Red Heifer #OTD???

זֹ֚את חֻקַּ֣ת הַתּוֹרָ֔ה אֲשֶׁר־צִוָּ֥ה יְהֹוָ֖ה לֵאמֹ֑ר דַּבֵּ֣ר ׀ אֶל־בְּנֵ֣י יִשְׂרָאֵ֗ל וְיִקְח֣וּ אֵלֶ֩יךָ֩ פָרָ֨ה אֲדֻמָּ֜ה תְּמִימָ֗ה אֲשֶׁ֤ר אֵֽין־בָּהּ֙ מ֔וּם אֲשֶׁ֛ר לֹא־עָלָ֥ה עָלֶ֖יהָ עֹֽל׃

This is the ritual law that יהוה has commanded:Instruct the Israelite people to bring you a red cow without blemish, in which there is no defect and on which no yoke has been laid.

זאת חקת התורה. לְפִי שֶׁהַשָּׂטָן וְאֻמּוֹת הָעוֹלָם מוֹנִין אֶת יִשְׂרָאֵל, לוֹמַר מַה הַמִּצְוָה הַזֹּאת וּמַה טַּעַם יֵשׁ בָּהּ? לְפִיכָךְ כָּתַב בָּהּ חֻקָּה — גְּזֵרָה הִיא מִלְּפָנַי, אֵין לְךָ רְשׁוּת לְהַרְהֵר אַחֲרֶיהָ (יומא ס"ז):

וזאת חקת התורה THIS IS THE ORDINANCE OF THE LAW — Because Satan and the nations of the world taunt Israel, saying, “What is this command and what reason is there for it”, on this account it (Scripture) writes (uses) the term חקה about it, implying: It is an enactment from before Me; you have no right to criticize it (Yoma 67b; cf. Midrash Tanchuma, Chukat 7).

Not being a historian, I have to question Rashi, is this true, the satan and the non-jews ask why do we do red heifer?

some explain because it makes those pure impure and impure pure. why would that cause me to question anything?

No Jew has gone OTD because of this question. No non-jew has ever asked me to explain. Why would this be the chok? many other things are just as illogical...

mixing wool and linen

milk and meat

kosher

niddah

and many others, why is this called the big question?