It is okay to disagree!
You can end a conversation saying something like:
"Well, it looks like we have a different opinion on that... And that’s okay, isn't it?
This is so simple and it does work.
You can see the same situation from different angles.
Mature relationships have space for differences in opinions
You build a system of beliefs which are your beliefs.
Your partner has other beliefs? No problem!
Let them be! Don't try to change them! Respect them!