The cross isn't originally Christian

This is a piece of historical evidence that might send many into shock, at the realization of just how much Judaic influence has twisted spiritual symbols towards their own agenda.
The cross, in ancient times, was a popular symbol that related to the balance and shape of the Soul. While it is present in many areas, its original meaning as exactly that was not known by everyone.
The equal armed cross directly shows off this balance of the Soul, but the cross shown at the left, the Latin cross, was a symbol based on the Egyptian Ankh. The top of the Ankh is the Shen ring, which is also shown in ancient Sumeria.
Additionally, at the right, one can see the Egyptian equivalent for the number zero. This number also meant "good" generally, pure, unaltered, as a sort of "base" that numbers are then added onto.
On the Christian side, the cross was adopted as a symbol only later into the cult's existence. At the very beginning, the main symbol was the Anchor and Fish, whose symbolism relates to the Apollonian cults, where a lot of the symbols of "Jesus" are stolen from.

As a Judaic byproduct, Christianity truly has nothing of its own, except the original anti-gentile beliefs present in all Abrahamic religion. Truth be told, even the Judaic symbols themselves are stolen, and so are the allegories, because that is what it is at the root: a subversion and inversion of symbols.