I did initially think of adding "The" in front of arise as in The Arise,joined together it sounded like theorize,but then i read what arise stood for and it didn't make sense having "the" at the front. Also the word theorize isn't really that relevant to your site.
Ideas (checked if available on Godaddy.com):
itsmyreligion.(net,info,org,biz) (thirteen letters)
free from faith (everything bar .com and .co.uk available)