The first thing to do when discussing how to prove god is a lie is to understand what proof is.
Proof is not convincing someone that what you say is true. It is not providing empirical evidence. It is providing a rational scientific proof. 100% proof that is not probable.
For example - many people try and convince others that something is true - by trying to convince them they are correct. This is typically inductive reasoning - but it is not proof.
For example - I see 100 swans and they are all white. This means I can infer - or try and convince you that all swans are white. It does not prove it is so - but if I ever see white swans then there is a probability I am correct.
What we need is rational proof. For instance - all men are mortal. Socrates is human - therefore Socrates is mortal. And so far as the premises are correct then - the conclusion and the proof will be true. Not probable but true.
It is suggested that the biblical god is all knowing - all powerful - and all loving. All that needs to prove god is not true is by proving any of these things is not true.
The Holocaust - demonstrates god is not all powerful or that is he is not all loving - because he would have stopped it if he is all loving and all powerful.
Similarly, if god is all knowing he could have stopped the first people from doing evil - before they did.
As you can see - god - at least the god of the bible is not true - assuming the premises are correct.
Please proceed to prove me wrong.