"Blood moon" has nothing to do with the rapture. The passage in Joel being used is in reference to the tribulation period not a sign of the rapture (of which there are no 'signs'). Given that Isreal has not yet built the temple, nor has the abomination of desolation been placed in the Holy place, Joel doesn't apply. It's (the blood moon) just a reflection of God's glory to be enjoyed.
If it could be proven beyond doubt that God exists...
and that He is the one spoken of in the Bible...
would you repent of your sins and place your faith in Jesus Christ?