But his mindset changed when his friend told him: "God showed me that my theology does not determine his action."
He's made dozens of trips out to the region as director of e3 Partners' work there, and heard many stories from Muslims about how they came to faith as a result of seeing Jesus in a dreams or vision.
Now Tom wants to share these amazing stories with other Christians. His book, co-written with Greg Webster, will be out from Thomas Nelson on 4 September.
In his addition to his own story, the book includes those documented by close friends in the region.
"If we couldn't verify the experience, we left it out – no Christian fairy tales here," Doyle writes.
In one amazing story, a Muslim kidnaps a Christian in Cairo, one of the most dangerous places in the world to spread the Gospel, and takes him at gunpoint to an abandoned warehouse. Inside, he meets a group of 10 imams, who tell him they have been having dreams about Jesus and ask him to teach them about the Bible.
Dreams and visions have become common among Muslims in the Middle East who have embraced the Christian faith. Doyle says the dreams open the door for Muslims to hear about Jesus in countries where spreading the Gospel is forbidden.
While the West associates Islam with terrorism, Doyle believes the majority of Muslims are peace-loving.
"I believe Islamic terrorism is Satan's attempt to keep the Gospel message away from Muslims," he writes.
But Tom knows that even Satan can't stop the Gospel from spreading.
"More Muslims are coming to faith in Jesus today than ever before," Doyle writes. "In fact, we believe more Muslims have become followers of Jesus in the last ten years than in the last 14 centuries of Islam."