If you're using sprintip.com relay there is a box below the number to dial. It says dialing instructions. In there you can say/type - please don't hang up this is a deaf caller asking about the church. Then the relay operator will try to explain the relay service. Most people are not going to understand it but it's worth repeating and see what happens. Or try an email to ask your question as well as teaching them about the relay service. I know it's a lot. There are lots of options. And Sorenson Video Relay Service (VRS) is for fluent American Sign Language signers using videos to contact an sing language interpreter to make video calls. There are also Voice Carry Over Relay where you can use your own voice. And caption calls as well.
Here are other options to try
These can be use with your voice and you can read the response.
https://sprintcaptel.com/
https://www.clearcaptions.com/
This has more information about relays in general
Note- the AIM services which is the AOL instant messaging is probably not use anymore due to the recent lack of AIM use.
https://www.verywellhealth.com/internet-relay-services-1046808
I remember using the old school TTY I don't know if it is avaiable anymore.
Anyways hope this info helps and keep on trying and have lots of patience.