The christian cross on the other hand symbolizes the cube being broken open, freeing us from the material prison it symbolizes.
Now the black sun. the black sun in pic related isnt so much in meaning our sun. while our sun is the material source of life, giving heat and light for plants to grow enabling all the other life, the black sun (as i believe) is the spiritual source, the divine spark, the source of our divine concioussness. probably the holy spirit, God. Since its round (edgless) its also the opposite of the black cube (edgy).
In general a lot of christian symbolism goes back to the sun. In example the cross with the circle around, also called suncross likely comes from the zodiac cross upon which the sun "stands". The Halo or Nimbus you see on a lot of saints, and also other divine figures from other mythologies originally also was just a shining light from behind the person or persons head. In case of Jesus specifically the halo often has the suncross embedded in it too.
So while kikes and muslims have saturn as their symbol of God, christianity has the sun. So dont come me with the "God is Saturn" bullshit
while we are at it, a lot of the symbols also seem to derive from sunworship as many symbols do. in case of the egypt one it seems to depict the sun touching the water or heaven being united with the earth while unification of polar opposites is an important theme in the occult. One believe was that magic springs into existence where 2 polar opposites meet. good and evil, the above and below, male and female. especially the unification of the last is one of the most holy events in many cultures where the magic of life happens and the first step for the existence of a new human has been made. i believe transgenderism is a perverted form of this, trying to unite male and female in one body/destroying duality