Hi hriu and welcome to the community forum.
Personally I’m not seeing this: the only apps I see running are those I’ve launched, or that are authorized to run in the background (and of course permanent services). Could you provide a list of apps that you feel shouldn’t be running but are? Could you also provide the build number of your OS version (go to Settings > About phone > Build number).
You should only be resorting to “force quit” with apps that freeze and become unresponsive. An app that you don’t want to use at all for long periods can be disabled, without actually uninstalling it.
As for saving battery, some apps will use less power if they’re allowed to run in the background, than if they’re stopped and started at intervals. They will also provide a better service. Mail apps are a typical example.
P.S. - If you wish to avoid Google you might consider moving to a different OS such as /e/ or Lineage. See