No, we just figure they are trying to repeal vampires. Besides Catholics don't usually wear crosses, usually, they wear crucifixes.
can Catholics wear the sign of David Cross?
No. Many Catholics wear a cross on their rosaries, but most Christians do not wear a cross at all.
Yes.
Sure. You can wear as many as you want.
Jews would probably not be offended by catholics wearing a mezuza. A Jew would not wear a Mezuza, since it's place is in the entrance to a domicile (on the right). Most probably a Jew would be amused by the ignorance of the catholic in using the Mezuza as a pendant, and attribute it to a lack of knowledge, or a misguided belief in spiritualism.
the religion where they wear the inverted crosses is the one related to belief in the anti-christ.
I wouldn't be and I'm from Jordan.
Crosses, I would imagine.
Some religions wear crosses as jewelery, or as clothing (eg., crosses on T'shirts). Jews sometimes wear prayer shawls called "Tallit".
You can do whatever you want.
No. Jehovah's Witnesses do not wear crosses which they view as symbols of pagan worship.
Normal clothes.