Who is right about Messiah? The Jews? The Samaritans? The Christians? The Muslims?

Judaism is a beautiful religion. A faith built upon the vision of the future deliverance soon to be manifested by a coming Messiah, who will himself be “a biological son” (or “descendant”), of David [the latter being not only the greatest Israelite king, but also “the son” of a noble Moabite woman named “Ruth”].
Yet, although the concept of “a Messiah son of David” is indeed a beautiful one [as it brings hope and inspiration upon those who embrace it], the problem with such idea is that it contradicts the revelation given by the Holy One unto our master Moses. You see, the Lord [blessed be He] commanded that no Moabite was to be allowed into the Holy congregation (“ An Ammonite or a Moabite shall not enter into the assembly of the LORD … ”- Deut. 23: 4 JPS, 1917 Edition).
So, as Ruth was a Moabite, she should’ve never be allowed into the Israelite congregation, and therefore the Israelite king David should have never existed. And with no king David, no “Messiah son of David” was supposed to ever exist [let alone claim David’s royal throne! ].
In fact, if we were to follow the Jewish sages [sticking to the literal sense of Hebrew Scriptures], we would be forced to accept that God never intended for Israel to have a formal [human] king. Why? Because having a human king [with the absolute powers such post entails] was the hallmark of Pagan nations, and was therefore unbecoming of the holy people, who were expected to recognize such absolute powers as belonging solely to their all knowing, Almighty, and morally perfect God.
And the former is the reason why, after the Israelites shamelessly demanding a human king for themselves [in order to be like the surrounding Pagan nations], prophet Samuel told Israelites that they had despised their Creator (thereby committing a veiled form of idolatry).
As is written: «Then all the elders of Israel... came to Samuel unto Ramah. And they said... “Behold, thou art old… now make us a king to judge us like all the nations ”... And the LORD said [to Samuel]… “Hearken unto the voice of the people in all that they say unto thee; for they have not rejected thee, but they have rejected Me, that I should not be king over them. According to all the works which they have done since the day that I brought them up out of Egypt even unto this day, in that they have forsaken Me, and served other gods, so do they also unto thee...
... hearken unto their voice; howbeit thou shalt earnestly forewarn them, and shalt declare unto them the [evil] manner of the king that shall reign over them ”. And Samuel told all the words of the LORD unto the people… And he said: “ This will be the manner of the king that shall reign over you … And ye shall cry out in that day because of your king whom ye shall have chosen you; and the LORD will not answer you in that day ”....
... But the people refused to hearken unto the voice of Samuel; and they said: “ Nay; but there shall be a king over us that we also may be like all the nations; and that our king may judge us, and go out before us, and fight our battles…” »- 1 Samuel 8: 4-20, JPS 1917 Edition.
Curiously, the former passage shines a light upon a paramount principle: That though Torah’s message is clear and concise (“ Thou shalt fear the LORD thy God; and Him [alone] shalt thou serve… Fear God, and keep His commandments; for this is the whole man ”- Deuteronomy 6: 13, & Ecclesiastes 12: 13, JPS Bible 1917 Edition), Israel would often go astray, rebelling against God’s will for their lives («But ye have this day rejected your God, who Himself saveth you out of all your calamities and your distresses; and ye have said unto Him: “Nay, but set a [human] king over us ”... »- 1 Samuel 10: 19, JPS 1917 Edition).
Yet, despite no longer living according to God’s will, the Lord’s mercy was so great that He would encourage Israel to still serve Him, in spite of their misguided disposition (“ Fear not [as your God is extremely merciful! ]; ye have indeed done all this evil; yet turn not aside from following the LORD, but serve the LORD with all your heart ”- 1 Samuel 12: 20, JPS 1917 Edition).
In short, even if he were to be the expected Messiah, having a flesh and blood king ruling upon Hebrew believers was always contrary to God’s will for His people. In fact, just as it is true with anything contrary to God’s will, having a human king will always be the cause of much pain, strife, and suffering for Israel.
Still, as neither Jews, Christians, nor Muslim have been able to overcome their fallen urge to be ruled by a “flesh and blood king” (Messiah), God’s mercy has graciously permitted such misguided idea to take hold in their midst; yet still encouraging them to serve Him [doing goodness], in spite of their faulty theology.
And from whence do we know God keeps encouraging both Jews, Christians, and Muslims to do good in spite of their faulty desire for a human king Messiah? We know it from the fact that the message of all these religions include a similar call to embrace goodness. As it has been said:

– Judaism: “ That which is hateful to you do not do to another; that is the entire Torah, and the rest is its interpretation... ”- Master Hillel, Babylonian Talmud (Shabbat 31a)

– Christianity: “Therefore, whatever you want others to do for you, do also the same for them, for this is the Law and the Prophets”- Jesus, Matthew 7: 12 (Christian Standard Bible)

– Islam: “ None of you will have faith until he loves for his brother what he loves for himself ”- Authentic Hadith, Sahih al-Bukhari 13, narrated by Anas Bin Malik