The idea of god has been used as justification for crimes against humanity for a long time. They claimed that their god told them to do it.

So true... They are merely just regurgitating what they and their predecessors were fed for generations.

These procrastinators, have had two thousand years to prove anything.
They haven't proven shit bro!!! (sorry, went apeshit there)

I don’t see why it’s impossible to prove god exists the same way we prove anything else exists.

It's funny that these people who believe they are doing what this god wants can look at others saying the same thing, but with whom they disagree, and will say that the other person only "thinks" they are doing what this god wants.

That's a very nice summation of the basic epistemological problem. One might better say, no useful ethical framework can assume the existence of god or really of any sort of externally bestowed, and/or inherent morality. Nothing based on an alleged supernatural being or realm can be a legitimate basis for ethics. Nor can it tie ethics to actual benefits and harms of actual actors, which is the only thing that will make an ethical system actually useful and effective.

This is, in a sense, what Immanuel Kant concluded in his Transcendental Dialectic. He showed that our minds only ever see the appearances of objects and not objects in themselves so God could never be seen or proved. But belief is another thing, and believing that ethics come from God and create social order is a matter of faith and not a given. Kant remained a nominal Christian for the sake of that social order.

As far as I'm concerned, anyone who claims to know what any god wants is clearly delusional, and needs immediate professional mental health assistance.

Assertions built on assertions. I find it an interesting exercise when listening to Christian accounts where they get really pushy about what must be true. Well, the ressurection MUST be true because people could have disavowed it. At the same time recognizing there are zero complete fragments of their claims from the time, and the only people invested in preserving anything would be the people claiming its true. The records of people who called bullshit would have been preserved by who?

Or claiming Tacitus .. followed by an explanation of how thorough and rigid a historian he is.... validates Jesus. Um no.. there is nothing in his claim that indicates he investigated it at all... so it is merely a reporting of hearsay... Christians say they believe this... which validates what those Christians believed, but NOT the claims.

So listen for the points where they make these claims.. not just what God wants you to do, but whether god was involved in something at all!! I listened to a pastor account how he was having challenges while selling his home to move on to his next flock. And out of the blue god provided a parishioner who wanted to give him free windows for his home... oh my... If a god were not involved, how would you determine this? And God picks favorites to give you windows... but anyone else sitting in that church struggling... well? And they eat it up!!

I would add delusional to your first sentence. I have known Christians that are totally convinced that your life is already mapped out for you by God. No amount of argument could sway them, and I’ve attended special public welcome nights at the local University highlighting debates on this subject and others like creationism vs evolution. It’s all in the bible according to them.

In the beginning people create God in their own image. I think it is an ego thing.

Anyone? 100% of the time? There's no option but to be lying?
Let's think about this for a little bit.
How do you know what those people are thinking? Are you psychic? You would either have to be psychic, or you're lying about knowing that they are lying. But they could be a third option... You could be mistaken, right?
I always say that there's not enough evidence to justify an existence of a god. Not that there's no god, and that anybody who says there is a god, is clearly lying.
God could still exist, whether or not I have enough evidence to prove his existence to myself. I don't know what other people thinks when they say that they believe, and the evidence they have. People can believe 100%, without a shadow of a doubt, that they are sure they're completely truthful about a statement they say, but still be wrong or mistaken.
People needs to be careful how they say certain statements, Christian and atheist alike, because the way they phrase the statements are sometimes wrong. So just be careful about how you approach statements people says, is all I'm saying.
I hope this helps. Have a good day!

How do you say it is impossible to prove I exist? How do you prove I have not eaten a taco?

What ever you think is God, non-existent flying spaghetti monster sky God, may truely be impossible to prove the existence thereof.

Just because you cannot prove Willy Wanka God or Harry Potter God does not mean I don't exist.

They could be lying, sure, but you're leaving out other more common possibilities.

For instance, they could be self-deceived - either as a result of mental illness or hallucination or some other delusion. Or, most often, it is because they themselves have been indoctrinated by some 3rd party and therefore believe via proxy what god wants.

I differentiate those conditions from a simple lie because I feel a lie is intentional and delusion is not necessarily so.

God wants apple pie. That is why he told the snake to threaten Eve.
God wants all the apples for himself. Asshole Apple hoarders.