If you have added more than one login methods to your account (Google, Twitter or email login method), you will be able to login the game through the other login methods and you won't lose the access to the game.
If you have registered the profile only via Facebook and you don't have access to the same Facebook profile, you won't be able to login and unfortunately you will lose access to your game profile.
We suggest you add more than one login methods to your game profile in order to avoid such login issues. If you are not sure how to add a new login method, please check our FAQ: How to add a login method
If you have registered the profile only via Facebook and you don't have access to the same Facebook profile, you won't be able to login and unfortunately you will lose access to your game profile.
We suggest you add more than one login methods to your game profile in order to avoid such login issues. If you are not sure how to add a new login method, please check our FAQ: How to add a login method