Creating a new religion is going to be nearly impossible. I don't mean to sound pessimistic, but you have to convince others of the legitimacy of your religion. It's a matter that requires a large group of people, a long struggle and many sacrifices. You will have to dedicate your whole life to the endeavor.
A better approach is to simply say that your religion (pick your favorite one) requires you to eat a certain food raw for (made up reasons) over the duration of (pick your timeline). No one will know better, bother checking and least of all argue with you, as it is politically incorrect. For example, you could just say "my sect of Islam, the Sufi, requires me to eat food raw during Eid-ul-Adha to honor the sacrifices of Muhammad to Alla during his Farewell Pilgrimage (pronounce it in arabic)".