In Islam, God isn't selective. Humans have absolute free will to do whatever they want and will be judged when the time comes. God does not intervene with the human psychology unless you be him for it(such as praying to God to have better control over your lust). God needn't actually send Muhammad to preach humanity if humanity hadn't deviated in the first place.
During the prophet Adam's time, his two sons Habil and Qabil, had quarelled, or rather Qabil had quarreled over who was to marry whose twin sister(explained on request because it's not relevant yet.). Habil had been the obedient one.
Thus, after killing Habil, Qabil felt shame and ran off with his wife to start a new life elsewhere. His descendants became lost and committed many sins from being away from the teachings of Adam. Adma later had another son who went on to become the successor.
Throughout history, God has sent plenty of his prophets to guide humanity back to the straight path. Most people didn't listen. So in that sense, God is not being selective in Islam.
Well, this is my opinion anyway. XD