Believing in a deity, is not the same as an organised religion. What’s not to understand? My mother believes in a version of the Christian deity, but she is in no way culpable for how organised religions conduct themselves.
I also thought atheism means one disagrees with religion
I have quoted verbatim, the dictionary definition of atheism, in both my previous posts, so how you arrive at this conclusion is baffling?
Atheism
noun
disbelief or lack of belief in the existence of God or gods.
Note that it makes no claims at all, and so none about deities or religions.