[svandamme]

actually , no , that would be a good answer

lack of proof and probability is not really an option in a 'what do you believe' question

that's a chickens answer
it's like saying :
" i don't think so cause it doesn't look like that, but don't want to say no in case he strikes me down with a lightning bolt from the heavens"

in my view there should only be 3 options

yes
yes, but not "a god" , just "something"
no

or if you must have 4
4th option would be "i believe there's a bunch of em" (ancient greek style, hindu, hawaiian ,etc etc)