Ummm, no, it didn’t persevere - I speak from first hand experience. What persevered was the syncrenetic practice of Santeria, and the celebration of the day of the three kings on January 6th. Cubans with any ambitions for higher education and employment did not baptize their children; Cubans born after 1959 did not know what Easter was.
The only truly religious people were a few Protestant sects - I am grieved to say that the Catholic church failed in every way to provide spiritual leadership of any kind. The archbishop of Havana is a notorious homosexual and collaborator with the regime, and the church was turned into a male brothel.
Point taken. My apologies for being misinformed.