Complex sentence: Because'air' in Jesus'day was a metaphor for that which is immaterial, I suspect that were Jesus with us, in the flesh, today, he would use' space'or' vacuum'--immaterialities.
Split into simpler sentences: Because'air' in Jesus'day was a metaphor for that which is immaterial. Some feel that were Jesus with us, in the flesh, today, he would use' space'or' vacuum'--immaterialities.