Children Exposured To Dangerous Religious/cult Practices

Just for reference, this is in Florida

My ex wife and I have been separated/divorced for 13, with two children (mid to early teens now).

About 10 years ago I discovered that she was initiating herself into Santeria. A religion brought over to the Caribbean by African slaves and mixed with Catholism to hide from their slave masters. This is a very popular religion here with a lot of animal sacrificing, playing with the blood of animals, promises to cure you of illnesses, provide you good fortune, and even attack your enemy (all of which requires you to pay the priest for performing rituals), extreme paranoia that once you are initiated into the religion you are responsible to care for your assigned saint by providing regular sacrifices and other duties. All of this is conducted in secrecy and this sharing of information is forbidden. I only know all of this because I was raised around it with my parents and siblings practicing it but I was afforded the opportunity to opt out.

My fear came true with my oldest son confirming that he and his brother were coarsed into the religion and initiated. They had their heads shaved for a period of time I could not see them, forced to eat and sleep on the floor for a week, witness multiple sacrificed and their blood squeezed over their assigned religious artifacts. My oldest also told me that he had to have his tongue touch the base of a severed goat head to show his fealty.

She refuses his allegations, calls her “religion” something else and then says that my family practices it as well to deflect/justify her beliefs.

What can I do?