Bill Maher got into a heated exchanged with his guests on the latest episode of his hit HBO show "Real Time" over the role Islam played in the recent terror attack in London - the worst for the UK since 2005.

Maher debated former British MP and journalist Louise Mensch on the implications of the Wednesday terror attack near the British parliament that killed four people and which ISIS quickly took credit for.

"The guy was British-born. His name was Adrian before his converted. And partisans of Russia were out in the streets saying it was an illegal immigrant who did it, trying to turn the London people against our Muslim friends and neighbors. And you're not going to do that," Mensch said to Maher.

"Let's not pretend this has nothing to do with Islam, the religion," he shot back.

Credit: HBO

"It doesn't," Mensch responded. "It has nothing to do with Islam the same way Timothy McVeigh had nothing to do with Roman Catholicism."

"Every time some bomb goes off, before it goes off, somebody yells ‘Allahu Akbar!’” said Maher. "I never hear anybody go ‘Merry Christmas! This one’s for the flying nun!’ ”

"That's a false equivalency. Are there Christian terrorist armies like ISIS?" Added Maher. The segment included verbal fireworks from MSNBC host Chris Hayes, author Max Brooks and Yale professor Timothy Snyder as the panel discussed the role of religion in terrorism.

The debated ended without any clear resolution. "I literally don't agree with you," Mensch concluded. "Russia is sending Chechen militants into ISIS trying to leverage this against a billion people."