Unlock OnePlus2 after reset and now in FRP I have reset my Android Phone (OnePlus2) after it froze. Now it wants me to log in to my previously used Google account.  

I know the PIN Code and the Code to Unlock the Screen and the fingerprint is also set to me. 
Is there a way to bypass this protection ?

IMHO this does not make any sense if there is no way. Any reasonable thief, who knows all this information can simply unlock the phone and disable OEM lock.

My only problem is that i forgot the Googlemail.
There are bypasses but it varies by phone. The best bet is to flash stock firmware. That's the only way I know to do it, because I've done it on my wife's Galaxy S5.