How Do I Talk My Parents Into Letting Me Get My Tonuge Pierced?

Im 13 And I Want My Tongue Pierced. But My Parents Think Its Stupid And My Body is Gods Temple And That I should Not Put Holes In My Tongue. I Was Wondering How I Could Get Them On My Side. I Am Going To Research Videos On Them And Write A Paper And Them Give Them A Deal, And Explain To Them Why I Want It. They Are All Freaky About Piercing That Show. Well This One Will Only Show When I Talk And Or Stick My tongue Out!!!!! Ugh I Am Sure They Are Going To Be Against It. My Dad Wont Care If My Mom Doesn't And I Think I Almost Got My Mom On My Side. I Just Need To Confirm Her Answer. PLEASE HELP ASAP!!!!