"And if Christ be not risen, then is our preaching vain, and your faith is also vain." (1 Cor. 15:14 KJV)
The thing is, until Christ's (much rumored) return Christianity is doomed to be in vain (regardless of whether or not he rose from the dead).
And it doesn't look like he's coming back anytime soon.
Should Christians give up hope?
They should find something more productive to do then practice a vain religion in the futile hope that Christ *might return *someday down the road at some *unknown point in *time.
Or they can hope against hope and add to the vapidness of it all.