This question already has an answer here:
I have added a Google account to my phone -- not voluntarily but because Google demands this if you want to install apps. Is there any way to hide this account from other apps like the calendar?
Removing all google data except the play store is a similar question. However for me it's not about not seeing the data stored by Google but about making sure I don't accidentally add new data there instead of to the services I actually use.