The arrogance in your reply answers the rhetorical question of this thread.
Why would anyone concern themselves with heaven or hell until there is proof that either exists?
I will make you a millionaire. All you have to do is send me 10% of your money and have faith. If you do not become a millionaire it is because you did not send me the money or you did not have enough faith.
Honestly, don't you find that argument a bit weak?
Even if I add the argument that if you do not send me your money and have enough faith then you will spend eternity burning in a lake of fire the argument is still weak.
Especially if I cannot show you a lake of fire with someone in it burning.
You seem to have a problem with preachers. I have never met anyone who has charged me to show me heaven or hell. I have met some crooks who have tried to convince me they can make me rich without me working, and some have even been Christians. But I learned to ignore them when I was a child.
I'm not claiming anything. G-d is claiming there is a heaven and a hell. And G-d can prove it. He has done so to me and He will do so to you.
For what it's worth, I don't preach a Christianity that is simply an entrance ticket into Heaven. The banquet is a personal relationship with G-d. That's what Christianity offers. That's all it offers. And it offers it for eternity. If you don't want it, you won't be forced to receive it.
But G-d is there and knowable right now. Not after you die, right now. He is not far off, he is knocking on the door of your heart.
Open your heart.
Shalom.