Q/A oh ye' atheist, why is thine head blockish?
Because God is proven. It is a philosophical concept woven into a Story to become theology where you arrive at words like “God”, “Christ”, or “Krishna”. There are numerous proofs throughout human culture that provide that answer. Anselm is my favorite in regard to Christianity with his Monologion.
You have nothing to worry about if they want proof except what they almost always do: become meanspirited asses. They start saying mean, non-sensical stuff to derail the conversation, and you should not indulge them. The moment you know the point has been scored, and they failed to follow up and instead began making non-sensical statements inconsistent with the flow of dialogue, walk away.
I’m serious. There is a proverb about the topic that says something like, “do not argue with a fool”, and by them diverting into nonsense because they do not understand logic and reason, they have become quite literally “fools”. It’s a state of existence they become as a result of the dialogue they engaged in and could not maintain—they bit off more than they can chew, so to speak. That is their loss and your gain, and in healthy dialogue, which that is not, both parties win, even when the argument goes in the favor of one party and in opposition of the other. So you shouldn’t ever worry if you find yourself arguing with a worthy opponent.
When atheists start being arrogant, stupid, and mean while trying to be snarky and humorous at your expense, they only want to waste your time. That itself is the insult on their part, because you were charitable and respectful enough to engage in conversation with them but they are ungrateful and do not deserve a single word more. That type of thing they are doing is among the oldest tricks in the book, and one of the most useless and ineffective ones too if you do not indulge them.
If you take their bait, you will become frustrated, exasperated, and even possibly angry because of the waste of your time and energy they put you through by being so disrespectful, rude, and uncivilized by being unable to have a reasonable conversation, but you should not let those moods catch you from their account.
Better you walk away knowing you did what you could, than rain down fire from heaven trying to show the glory of the Lord to them with truth on high. Doing so will amount to pearls before swine if you are arguing Christ to them. If you want to get dirty and “fight fire with fire” to show them that you are not too good to throw a punch, then descend to their level where Jesus walked the earth like any one of us, and crush them on earth with a good old fashioned insult in return.
Ah, yes… nothing like a good ol’ logobrawl. If you are good, you may even take more from them than their initial wager, but you also may lose some because they may have a good comeback, or the bouncer gets called and throws you both out. Do that in public directly to them and in the open, and do not hide yourself like you are afraid to be seen “in the flesh” or carousing like a sailor such as myself. Usually I keep that kind of behavior for the lovely maidens, partying like it’s 1999, or playing sports. It’s quite the charity for a stranger who has made himself your enemy, and if you are doing that for them, you oughta make it hurt so they aren’t left wanting for more of your words, but not too brutal unless you quite literally intend to kill because of how grave their offense is.
Most importantly about that, never take that back with you into your private home and think your hate, wrath, and rage through poisonous gossip will reach them through the spirit while you grind your teeth over what you should have said. That will backfire. Leave it under the monkeybars and go wash your hands to get ready for supper. There are more important matters to deal with in life than those.
And one last word of warning, if you don’t know what you are doing when you rain down fire from heaven, and I mean as a professional or expert on the subject, it is too dangerous to be trifled with and you’ll likely just set the house on fire along with your cloak and tunic, so it’s generally a bad idea. If that’s called for, you’ll know when the time is right and won’t need to think about what to say.