How many founders did Islam have?


Islam, that means in Arabic peace and submission to the one and only one God, is the call of all God prophets (including Noah, Abraham, Moses, Jesus, and Muhammad) for people since start of mankind.

So, if the question talks about Islam in this sense, then all God prophets are founders of Islam.

However, as Judaism and Christianity are religions per God revelation of respectively Torah and Bible to respectively the prophets Moses and Jesus, the very name Islam is the religion per God revelation of Quran to the prophet Muhammad.

So, if the question talks about Islam religion per God revelation of Quran to Prophet Muhammad, then he is the only founder of Islam religion per the holy book Quran and his teachings (sayings and practices).