Darrel Ray said this quote
“ Islam began as a tribal religion, whereas Christianity began more as an individual or family religion. Christianity struck out from Palestine, converting one person or one family at a time. After the initial successes and conquests by Mohammed and his tribe, conversions were as much military as spiritual. Mohammed was both a political and military genius and used his success and charisma to convince the superstitious tribes around him that he had Allah on his side. As such, the sword was the instrument of persuasion. ”