295. The first religion of the world is Islam.
Verses (2:132, 3:52, 3:64, 3:67, 3:80, 3:102, 5:111, 6:163, 7:126, 10:72, 10:84, 10:90, 12:101, 22:78, 27:42, 43:69, 46:15, 51:36) of the Quran call the virtuous people who lived before Prophet Muhammad’s period as Muslims.
Most of the people believe Islam was introduced with the advent of Prophet Muhammad, but they fail to understand that it is an ideology introduced along with the creation of the first human being.
There is only one God for the entire cosmos, and there is another life in the hereafter for humans, are the basic ideologies propounded by Islam to men right from the the first human being. Laws regarding the implementation of this ideology were introduced as per need to suit the requirements of communities/societies till the period of Prophet Muhammad.
Hence it is concluded, the way of life propounded by messengers of God before Prophet Muhammad is also Islam.
Verse 22:78 of the Quran clearly conveys this message.