Last June I prepared for an Advanced DNA course at GRIP by reviewing many videos and webinars on DNA topics and tools. You can see the links to those blog posts and the results of my preparations here. I have not been as successful in finding videos and webinars on religion and church records. However, I did find several.
Ancestry Academy has a variety of videos on genealogical research. In one video, the SLIG 2020 course coordinator, Rev. David McDonald, DMin, CG, discusses "Church & Religious Records: Their Use in Genealogical Research." A search for the term "church" at Ancestry Academy results in a list of 40+ other videos that discuss church records as part of a larger topic. For example, a video on vital records is in the results, which makes sense since church records can provide a great substitute for local and state vital records. Ancestry Academy is free with an Ancestry login; I don't believe you need to have a paid membership, just a login.
One of my favorite webinar resources, FamilyTreeWebinars, now has over 1000 webinars on genealogical topics. There is an annual fee of $49.95, discounts are available most weeks with codes made available from the free live webinars. Most webinars are free for 7 days after their live debut so discount codes can be seen on most recent videos.
Using the search terms, "church" and "register" separately, I found 12 webinars. Since all webinars are older than 7 days, you will need a subscription to view them but the links allow you to read about them and see a preview.
Finding Your Roots in Catholic Records, presented by Lisa Toth Salinas
From FamilySearch.org - Many videos free online with free registration and login
Links to videos available with search term, "church records."