I take it a step farther: Even people in my religion are heretics.
To be a true blessed believer, you must be ME.
Ah, forgive me, so this is about THE cat, not just any dog.
You may think that is what is being said, but it isn’t.
There is a difference between proclaiming and teaching views that are clearly not part of a faith’s doctrines, and people who agree on the doctrines essential to be considered as faithful to their particular faith, but have disagreements on non-essential issues.
This seven point breakdown touches on the former. There are differences in main essential points about who God is, what is required for salvation, etc. These are not minor points.