Since I'm an IPITA (Identified Pain In The Ass), I have to ask:
1) Are you asking "Do you believe that Unidentified Flying Objects exist"?
or
2) Are you asking "Do you believe, as "have faith", in Unidentified Flying Objects?
or
3) Are you asking "Do you believe that all Unidentified Flying Objects have been identified and therefore there are no Unidentified Flying Objects?