Is it proper for a Christian to have a Mezuzah on their home.?

We are a Roman Catholic family from a small town. When my parents built a new house in 1969, a wonderful friend and member of the community - Rabbi Sandberg - blessed our home with the hanging of a Mezuzah at the front door. He didn't think it was wrong, my parents didn't think it was wrong, and it still hangs in the same spot though the door frame has been painted many times. We cherished his friendship and the thought that he asked God's blessing for us. Over the years, it has been a reminder to us to ask God's blessings for our friends. If it ever becomes necessary to sell the house, I know any of us in the family would like to have it if the new owners want to take it down.

Anglicized form of the Hebrew word used in the Bible generally to designate a doorjamb or doorpost. Mezu·zah′ and the plural mezu·zohth′ appear at Exodus 12:7 (ftn), 22, 23, with reference to the sprinkling of the Passover victim’s blood on doorposts, and at Exodus 21:6, regarding a slave who, desiring to remain in his master’s service, was brought up against the door or “the doorpost” and had his master pierce his ear with an awl. References are also made to doorposts of the temple constructed by Solomon (1Ki 6:31, 33; 7:5) and of the symbolic temple Ezekiel saw in vision.—Eze 41:21; 45:19; 46:2.

In modern times the Anglicized term “mezuzah” is used to denote a rectangular piece of parchment containing the Hebrew text of Deuteronomy 6:4-9 and Deuteronomy 11:13-21, generally written in 22 lines. The parchment is rolled up and placed in a wooden, metal, or glass case that is affixed in a slanting position on the right-hand doorpost of Orthodox Jewish dwellings, the upper part pointing inward and the lower part outward. The Hebrew word Shad·dai′ (meaning “Almighty”) is written on the back of this parchment and is frequently visible through a glass-covered opening in the container. Sometimes the mezuzah case is artistically decorated. When pious Orthodox Jews enter or leave a house, they touch the mezuzah with the hand and recite the prayer, “May God keep my going out and my coming in from now on and ever more.”—Compare Ps 121:8.

Christian manners require one also to be careful about what he says. Not to needlessly offend and so close the ears of the listeners to the good news of God’s kingdom the Christian must be alert and observant. If he notices a Jewish mezuzah on the doorpost he will proceed differently than if he sees a crucifix hanging from the neck of the householder. At the same time he should not “talk up” to the “cultured” householder nor “talk down” to the lowly one

Of course they can have a mezuzah on/in their home. The Bible doesn't tell us exactly what it is, but for Jews, it contains a verse from the Torah written on parchment.

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I'm not sure whether it's proper or not, but why would a Christian want to? Unless it's just for decoration purpose.

If you are a Christian, Christ should be in your home and over your home.

I don't know if it is proper or not, but I know some in my church do have them. I think it probably cannot hurt but it's not necessary.

its just a thing for jews, dont get caught in the judaising heresy

it isn't proper for you to judge what others do.

romans 2:1

no.