Impossible Journey, A Tale of Times and Truth

"We’d like to talk about it now if you don’t mind."
Mark, who has been sipping his brandy and puffing on his cigar as usual, takes another sip and another puff and sighs, "Ah, what th' heck? Let 'em talk about it now, if they want and get it out of their system, so to speak."
This time Daniel takes the lead. "Well you see, there is no use to try to play God and try to eliminate sin in the world. If God wanted sin eliminated, He would have done so Himself. But, the presence of sin in the world is a necessity, just as darkness is necessary in order to make the light shine more. But the main thing is that if there were no sin in the world, Jesus wouldn’t have had to come and die for the world. Faith in Him is the real answer to the sin problem. He came to save people from sin. He offers both forgiveness and the power of a new life. So all we have to do to make the world better is repent of our sins and accept Jesus as our savior and try, with His help, to get other people to do the same."
"And you actually believe that?" asks John.
"We certainly do." all three answer at the same time.
"Well, I think it’s the biggest bunch of foolishness I've ever heard! What about you, Mark?"
Mark has just taken a big puff on his cigar and is blowing the smoke out slowly, while he searches the faces of the three time travelers. "Yeah, that’s for sure, John!” he says slowly, looking from Walt to Kerry to Daniel. “So all three of you became Christians eh? Well, that’s one for the books!"
"And," adds Walt, "we definitely will not continue with the mission, because it is doomed to fail anyway.”
"In fact,” continues Daniel, “we’d like to warn you not to try to continue it. You might as well abandon it, because it can never succeed, due to the fact that it's based on a wrong premise. But, if you insist on continuing it, you’ll have to send someone else to go back, because we won’t go."
"Of course, we’ll continue the mission" insists John. "Don’t be silly! Why shouldn’t we?"
"Because,” answers Daniel, “you are playing God and going against the plan of the one true Almighty God. Thus, it never will succeed."
"That’s right" adds Kerry, "It cannot succeed. Either you will all become believers in Jesus like us before this is all over with, or you will be destroyed in some way by God or one of His messengers. Jesus Christ is the only answer for the problem of sin and evil in the World. There can be no other."