The existence of God does is not dependent on peoples beliefs; He either exists or He does not. It's the same with the veracity of His word; It is either true or it is false and your opinion changes nothing. If you know for an absolute fact that Goes does not exist or His word is false, do what you will. If it's true, however, you may very well find yourself in opposition to your creator and for that there may be undesirable repercussions. Repent and put your trust in Jesus.