In the believer's knowledge. A person's advancement in the knowledge of the Word of God is an essential characteristic of genuine spirituality. A believer reveals whether or not they are spiritual by their attitude toward the Word of God. In the believer's home. In the believer's church fellowship.
Spiritual gifts are to be exercised within the confines of the local church.
Your level of activity and involvement in this ministry indicates your spirituality. Challenge them to honestly evaluate what goes on in their services with what the Word of God says. Pray for them, but do not be intimidated by them. Do some self-examination and honestly evaluate your own spirituality in light of God's Word.