If you're so worried about safety, privacy and encryption over Samsung changing Messaging to Google, you might want to try Signal.
https://signal.org
Android - https://play.google.com/store/apps/details?id=org.thoughtcrime.securesms&hl=en_GB
iOS - https://apps.apple.com/us/app/signal-private-messenger/id874139669
You don't even have to give out your number, you can create an alias.