BIRMINGHAM, Alabama - Alabama-based creationist writer Darek Isaacs has created a stir with his assertion that dragons must be real because they are mentioned in the Bible.

"The Bible speaks about dragons,” Isaacs said in an interview on the talk show Creation Today, posted on YouTube. "Our authority, everything we do, we have to measure by the word of God. That is what I believe. So we have to go to the Bible, and the Bible speaks about dragons."

Cover of "Dragons or Dinosaurs" book by Darek Isaacs.

Isaacs is a filmmaker and author of "Dragons or Dinosaurs: Creation or Evolution?" He has spoken at Beth Hallel Messianic Congregation in Hoover, where he lived for a time, said the former pastor there, Rabbi Eric Walker.

Walker said he believes Isaacs' assertion that dragons must be real because they are in the Bible. "He’s an armor-plated defender of biblical creation," said Walker, who left as pastor of Beth Hallel on May 11 for a sabbatical and recently announced he’s not returning.

In the Book of Revelation, Satan is compared to a dragon.

“If dragons in fact were entirely mythological, if they were a figment of the imagination, and if they never ever did exist, then God just compared our adversary to a make-believe creature that never existed,” Isaacs said on Creation Today.

The interview was the subject of a news report on the Huffington Post web site.

Isaacs sells copies of his books and videos through his web site, www.watchmen33.com.