If you run stock firmware and it's bootlooping, there's really not much that you can do because you don't have source code to the firmware you're running.
Your boot log seems to have a couple of interesting parts. I think this might suggest some kind of permission problem. Have you touched SELinux stuff (e.g. changed ACLs)?
[ 0.629174] ------------[ cut ...
Install Platform-tools on your computer (google if don't know how to)
Enable Developer Options on your phone (google if don't know how to)
Then enable USB debugging in developer options
Then give the command
adb shell pm uninstall --user 0 com.google.android.gm