It depends on what evidence are you looking for.
Solid, well-documented evidence of an event that cannot reasonably be explained through the naturalistic means we have available to us and/or seems to strongly indicate some sort of supernatural cause. Basically, let's say I told you that your house would be hit by a meteor if you didn't send me $100. What kind of evidence would you expect before forking over the cash? Probably not this:
The best evidence would be experiencing God on your skin, experiencing His uncreated energies and having a theoria of Him in His full grace, but for that you have to struggle in ascetism, in unstopped prayer and in sinlessness, but that's too hard, right?
"Too hard"? Dude, let's be clear on something here! You're asking me to undergo a whole lot of suffering - not just prayer and religious rituals, but
active ascetism - in order to receive a benefit I do not believe exists.
Imagine you're speaking to someone, and they tell you, "Okay, I've got this awesome mega-mansion in the Caribbean with a dolphin pool and a games lounge with every video game ever published and a 10-story water slide." Then, you tell them that you don't believe that they have any such thing. But they continue, "Dude, if you do my laundry for a year, I'll take you on vacation with me to see the mega-mansion!" Would you do their laundry for a year if you didn't believe them on the off chance they might be telling you the truth?
Please, try to put yourself in my shoes for a minute. Try to look at this from my perspective. I don't believe that any god exists. I am asking why
you might believe this, or how I might come to know god. In response, you offer me something which not only opens me up to massive self-delusion (along the veins of "I can't be wrong, there
must be a god, I've spent my whole life suffering for this!") but which requires a massive shift in my lifestyle. Huh. That's nice. I'm not going to do your laundry, though. Can you understand why?
Let's suppose a peasant from the countryside is arguing with a mathematician. The peasant keeps yelling that the Pythagorean theorem it's a lie and that he has no proofs for it, while the mathematician keeps telling that he can teach the peasant to make the theorem himself and that it of course exists, but it's the peasant's fault that he has no preparation to observe it or to calculate it.
Of course, the difference being that demonstrating the pythagorean theorem is very basic, and doesn't require any massive lifestyle shift. It requires nothing more than a simple application of logic in accordance with well-established mathematical definitions. To put it bluntly, you're comparing changing your entire life to, well, this:
It is a big square, with each side having a length of
a+b, so the total area is:
A = (a+b)(a+b)
First, the smaller (tilted) square has an area of A = c2
And there are four triangles, each one has an area of A =½ab
So all four of them combined is A = 4(½ab) = 2ab
So, adding up the tilted square and the 4 triangles gives: A = c2+2ab
The area of the
large square is equal to the area of the
tilted square and the 4 triangles. This can be written as:
(a+b)(a+b) = c2+2ab
NOW, let us rearrange this to see if we can get the pythagoras theorem:
Start with: (a+b)(a+b) = c2 + 2ab
Expand (a+b)(a+b): a2 + 2ab + b2 = c2 + 2ab
Subtract "2ab" from both sides: a2 + b2 = c2
If your god was as easy to prove as that,
there would be no atheists. Hell, pick
any solved mathematical theorem - if your god was that easy to prove, there would be no atheists.
But instead, the path to proving your god involves undergoing a massive shift in one's own life. The kind of shift
nobody would perform if they did not already believe, or did not desperately
want to believe; the kind of shift that sets us up for massive self-delusion. If that is the only way to prove god, then you don't
have proof.