You can make up your own religions. You can also find yourself ridiculed, ignored, arrested, and possibly even executed.
My advice: Pick Talad or Xiosia as your god(dess) of choice and make up a splinter group that believes in worshiping him/her with 'buddhist ideologies'. Xiosia may be a good bet, as her worship is very new and has not yet settled into a firm set of beliefs. Her followers range from 'Flower power hippies' to 'murderous nature crusaders'.