(CNN) If you're a Christian who exploits people, leads a double life or manages a "dirty" business, perhaps it's better not to call yourself a believer, Pope Francis suggested in a homily on Thursday in Rome.

"So many Christians are like this, and these people scandalize others," Francis said during morning Mass at Casa Santa Marta, according to Vatican Radio. "How many times have we heard -- all of us, around the neighborhood and elsewhere -- 'But to be a Catholic like that, it's better to be an atheist.' It is that: scandal."

"But what is scandal? Scandal is saying one thing and doing another."

In the Catholic Church, causing scandal also a grave offense.

Examples of such sins abound, the Pope said, from money launderers to business owners who take beach vacations while stiffing their employees.

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