I do fear that by over emphasizing the union of marriage it slights the individual Covenant each person has with G-d, and the many Commandments.
In Judaism it really depends on personal observance. Marriage is not considered the most sacred commandment, and never has been, though I’m not discounting it. I’m sure there are Talmudic scholars debating this amongst themselves as we speak somewhere.
When Yemenite and Ethiopeon Jews arrived in Israel, with unique thousand year old traditions, some were still practicing Biblical style polygyny. It was an interesting predicament.
As an aside, it’s considered forbidden to proselytize and act as missionaries for Judaism. Instead, it is said that by living by example, and doing good deeds, the Jewish people are filling their quota, so to speak, acting as ambassadors. One ultra orthodox movement, called Chabbad goes the furthest to do outreach and education, and pushes that line. Still, their focus is typically towards secular Jews.
I understand your points, however *Marraige* in itself is the cornerstone of any civilized society, it is the most *Sacred* because it brings fourth life creating human beings that have both a Male and Female parent that G-d created himself....
This sacred covenant was started before anything else with G-d’s creation of *people* in fact G-d was so angered with what peverted marraige he destroyed the world with a flood in Noah’s Day and he destroyed Sodom...
Can you think of a more Sacred Covenant than the Marraige Covenant?