The Christian view of God's vengeful, destructive side must be justified and reconciled into an overview of Good/Evil and the reward of pious behavior versus the punishment of sinful non-pious behavior. A sort of cause and effect explanation as with reward and punishment, but many times innocents are punished such as starvation of children (in the center of the painting looking at the pair of pears on the other side of the painting), and the many innocent casualties of war or "collateral damage" (represented by the torso in flames) which have really done nothing to bring such atrocities upon themselves.
The idea was to represent a mural painted on a wall where the building was being demolished by a wrecking ball and the "real world" on the right side exactly matches the mural in colors. The wrecking ball symbolizes God's destructive side (coming from an opening in the sky - the heavens).
The Old woman in the foreground having just received the Eucharist (meaning literally "gratitude") of communion being the commemorating of the death of Christ by receiving the sacrament through the symbolic eating of the body of Christ represents her extremely devout faith.
The three blocks of air represent the holy trinity's omnipresence floating through air (the nearest with the rosary hanging). The giant cloud wrapping around through the arch is God's presence. The broken clock symbolizing that this will continue forever.