Hi Passer - I disagree that beliefs have to be based on reality.  Orthodox Catholics believe that in communion they are literally imbibing the blood and body of Christ (who died for their sins) .  Transubstantiation. 
 That's really not reality and even high school chemistry students can deconstruct that one.

But as to your vital question about being around for eternity - where's the evidence you won't be?  Maybe all house sparrows live forever.