I advise you don't quit your corrent job for bitcoin. I think you should rather be doing both jobs simultaneously. You can even also be investing your earnings in bitcoins.
True! Bitcoin is indeed very much profitable thing but I dont really think so that quitting your job will be some good decision. Instead of quitting your job, the thing which can help you in a better way is to manage your time this much efficiently that you can do both the things at the very same time. This will eventually work in your favor and you will be able to make more money at the end.