“If we, or an angel from heaven, preach any other gospel to you than what we have preached to you, let him be accursed.”
The ‘prophet’ of islam, Muhammed, started the new religion based on the message from an angel that is contrary to the gospel of the Bible, the gospel of Jesus, the gospel Paul preached.
The Bible says Muhammed and the angel and the preachers of his religion—“. . . let them go to hell.”
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A Bible-believing Christian must first have the truth above firmly established inside himself, herself, before developing relationships with Muslims to share the gospel of Jesus—the Truth—in the most winsome way possible.