Imagine the first manned spaceflight to Mars. The mission will take several years. Four or five astronauts will be shut into a small metal box for month after month, speeding towards the red planet. They've done all the training, they have their assigned tasks to perform, and yet very little can prepare them for being, to all intents and purposes, imprisoned in a capsule with absolutely no way out. So they'd better
really know how to live together for long periods of time.
Day three or four arrives - the first few days were a rush of non-stop instrument checks and putting the spacecraft into 'cruise mode' for this immense journey of millions of kilometres. The crew settle down for the long haul and finally they have time to relax and chat for the first time. They all talk about what they will miss most about Earth. For one of them it's good food, for another it's walking in the woods back home. They all take their turns.
"So Bob, what will you miss most about good old planet Earth?" one asks.
Bob smiles and says, "I'll miss preaching the word of the Lord to the sinners and the blasphemers and the atheists. I'll miss knocking on the doors and witnessing to those poor helpless souls about the power of Jeeeeesus and the evils of saying that the universe is older than 6000 years old - lies, all lies. I'll miss praising God's mighty creation and cursing the wickedness that the evolutionists tell our children."
He adds, "But at least I have you guys to share the wonders of God's awesome universe for the next couple of years. Come on, praise Jesus our Lord and Saviour with me. Come on, don't be shy now."
Such a shame that on a routine check of the airlock Bob becomes the first man to perform a space walk without a suit. You'd have thought that God would protect him.
Moral: mission to Mars good, missionary to Mars bad.
Footnote:If Jeebus comes back for the Rapture how does that work with the people up in space anyway? The Bible is strangely silent about what happens to anyone caught in the International Space Station when the rivers of blood start flowing.