Elon Musk resurfaced on Twitter in a big way ... this time with a pic of someone arguably more famous than him -- the Pope!!!

There's Elon at the Vatican, mugging with Pope Francis and 4 of his 7 kids, saying "Honored to meet @Pontifex yesterday," adding, "My suit is tragic."

Here's what's interesting ... Elon's talked in the past that he's an atheist -- nevertheless, the Pope is the Pope so no reason not to shake hands and have a chat.

One of the kids who did not attend -- Vivian Jenna Wilson, previously known as Xavier, who announced a few weeks back she's a transgender woman and wants no relationship whatsoever with her dad.

As for Elon's religious history ... he was not raised a Catholic, although he did attend Anglican Sunday School. He has said in the past he is not Christian.

He seems to embrace elements of Christianity, once saying "I agree with the principles that Jesus advocated. There's some great wisdom in the teachings of Jesus, and I agree with those teachings," adding, "Things like 'turn the other cheek' are very important, as opposed to 'an eye for an eye'. An eye for an eye leaves everyone blind."

See the article here:

Elon Musk and 4 of His Kids Meet Pope Francis at the Vatican - TMZ