Facebook co-founder and CEO Mark Zuckerberg said in a post on his social media network that while he once questioned his Jewish upbringing, he now believes that “religion is very important.”

The post came after he wished his followers a “Merry Christmas and Happy Hanukkah” on December 25, according to reports over the weekend.

Zuckerberg once identified himself as an atheist.

In response to a comment which said “But aren’t you an atheist,” Zuckerberg replied: “No. I was raised Jewish and then I went through a period where I questioned things, but now I believe religion is very important.”

Zuckerberg’s wife, Priscilla Chan, practices Buddhism. The couple met with Pope Francis at the Vatican last summer

Pope Francis meets Facebook founder and CEO Mark Zuckerberg, at the Santa Marta residence, the guest house in Vatican City where the pope lives, August 29, 2016. (L'Osservatore Romano/Pool/AP)

Pope Francis meets Facebook founder and CEO Mark Zuckerberg, at the Santa Marta residence, the guest house in Vatican City where the pope lives, August 29, 2016. (L’Osservatore Romano/Pool/AP)