The Catholics were threatened with phrases like "I swear by the Quran, I will cut your throats".
While hate crimes have a higher frequency in France and Germany, they tend to be more severe in Spain and France.
The police arrested a 36-year-old suspect during the night as he was trying to flee.
The Mayor of Le Pian-sur-Garonne was also very upset by the action, the police are investigating.
Trans-activists want to rename the Cathedral "Our Lady of the Survivors of Child Crime."
The 28-year-old suspect was found with a loaded gun and had already been known for other offences.