Sorry but i dont think a lot of people know this
Well the exact translation of Islam is submission. So the belief in the existence of the Islamic god Allah, as well as angels. Belief that the Quran is legitamite. Then there's other stuuf like the Gospel (showed to Jesus), the Torah (Moses), then finally Psalms (David). Bascially saying like submit yourself to Allah and what not.
The open door policy was principles that was installed in 1899 and then the 1900s to Have a protection of equal or even trading among countries
