Ruby on Rails

Greetings RoR Friends! I would SO APPRECIATE your help with a question. I have read the Rails Guides, Stack Overflow, and tutorials but still seem to fail at grasping some basic RoR Association Conventions.

I will share with you the gist of the project layout and a picture of my models and associations. Please let me know if this is correct. Especially if the "has_and_belongs_to_many is reduntant.

Overview: A web application where a church profile can be logged into by multiple users. These users will upload sermons which can be viewed from the church profile. The church profile categorizes the sermons based on either the speaker, a series, or a topic. That's it! 

Here is a picture of my models. Is this the correct way?

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