When Islam first arose, many Christian scholars thought that it was some sort of Christian creed ~ possibly heretical, but a creed with which they might have some sort of debate .....
..... of course they soon found out differently, and in the centuries since, the two civilisations have grown further apart, not closer together, but as we largely didn't inhabit the same space, we rarely clashed anymore ~ except for those poor Christian souls who lived under Muslim domination (but there won't be any of them left by 2050 AD).
