Interpretations vary in regards to the Cross symbolism, as different and different traditions supply different information and thus interpretation.
However, the shared, fundamental element among these variations is that the Cross is astronomical/astrological.

A. Churchward explains the Cross symbol as related to the winter solstice( death/birth of the sun) as derived from the Egyptian religion below. A pivot summarizing notion is:

"...The Christian doctrine of the crucifixion with the victim raised aloft as the sin-offering for all the world is but a metaphrastic rending of the primitive meaning, a shadow of the original, which, as we have seen, went back to Stellar(stars) Cult..."

[ Churchward, Albert: The Origin & Evolution of Religion, p363-364 ]