[annalex]

Depending on the issue, different legal venues exist, including the Congregation of the Doctrines of the Faith, wich is formerly known as the Holy Inquisition.

Any Catholic is subject to canon laws.

[GunRunner]

These are guidelines of membership for a private organization. There are no legally binding punishments that the church can hand down that have to be compulsorily followed or carried out by a state. That is a good thing.

If someone is excommunicated from the church and they still show up, they would be prosecuted under trespassing laws, not religious laws.