I went garage sale shopping this morning and was purchasing some items from one and was told that 100% of the proceeds would be going to their church. The name was “The Good Shepard” or something like that, but they belonged to the “Independent Catholic Church of the West” I purchased the items and was curious if Catholics can buy from these groups or their thrift stores or does it constitute support of their beliefs that are possibly against the Churches teaching?
This link should answer your question on the permissibility of purchasing goods or services whose proceeds will support non-Catholic churches. If you have any further questions or concerns that are not answered by this link, please contact Catholic Answers directly.
Is it wrong to go to a Protestant church rummage sale?