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Another guy comes through the door. “What religion are you?”
“Catholic. Catholic priest.”
“You look real sharp in that outfit.”
“Thanks. Where do you go to church?”
“Greenville Christian Fellowship. I used to be Catholic.”
“That means you’re still Catholic. You should come to Our Lady of the Rosary sometime.”

I'm guessing he hasn't been told about the requisite paperwork:

"Roman Catholics, the largest U.S. church with a reported 69 million members, start counting baptized infants as members and often don’t remove people until they die. Most membership surveys don’t actually count who’s in the pews on Sunday. To be disenrolled, Catholics must write a bishop to ask that their baptisms be revoked..."
....it is possible, for example, to be born Catholic, married Methodist, die Lutheran and still be listed as a member of the 1 billion-member Roman Catholic Church....
"...The Catholic understanding of membership is that a person becomes a member upon baptism and remains a member for life," Gautier said. "Whether you show up at church or not is not what determines whether you're a member."
-- from the thread When It Comes to Church Membership Numbers, the Devil's in the Details

"Catholics must write a bishop to ask that their baptisms be revoked..."

"...The Catholic understanding of membership is that a person becomes a member upon baptism and remains a member for life,"

I agree with latter, and if the author claims to be quoting facts he's contradicting himself with the former. Let me give you and your sources the real facts.

1272 Incorporated into Christ by Baptism, the person baptized is configured to Christ. Baptism seals the Christian with the indelible spiritual mark (character) of his belonging to Christ. No sin can erase this mark, even if sin prevents Baptism from bearing the fruits of salvation. Given once for all, Baptism cannot be repeated.

Source: CCC