During an appearance Friday on MSNBC, Moore noted the coincidental timing of Gustav, which threatened the Gulf Coast on the third anniversary of Hurricane Katrina as the Republican Party planned to hold its convention in St. Paul, Minn.
"I was just thinking, this Gustav is proof that there is a God in heaven," the Oscar-winning director of "Fahrenheit 911" said. "To just have it planned at the same time, that it would actually be on its way to New Orleans for Day One of the Republican convention, up in the Twin Cities, at the top of the Mississippi River."
Moore added that he hoped no one gets hurt and everyone takes cover.
Rep. Steve Scalise, R-La., told Fox News Channel Moore should apologize.
"People in Louisiana, regardless of political affiliation, are making plans to leave to protect their families from this serious storm, and the God I know would not share Michael Moore's glee for our plight," he said.