God of Judaists and Christians and Muhammad
It is said that before Muhammad Arabs were worshiping various gods.
They also knew and worshiped the God of Judaists and the God of Christians. But they also worshiped other gods. Then, Muhammad arose, proclaiming that the only true god is the God of Judaists and Christians. Muhammad requested Arabs to worship only the God of Judaists and Christians.
So, Muhammad must have though that he would be welcomed by Judaists and Christians. But Judaists and Christians rejected him.
In response, Muhammad launched his own religion, though still worshiping the God of Judaists and Christians.
It may not be too late for Juadaists and Christians to admit Islam, though.
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Mat 7:1 Judge not, that ye be not judged.
Mat 7:2 For with what judgment ye judge, ye shall be judged: and with what measure ye mete, it shall be measured to you again.