Atheists and/or skeptics are wont to demand scientific evidence for the existence of God. But such a demand is ridiculous. Why? Because God is universal mind or consciousness and mind or consciousness cannot be objectively measured or observed; it can only be inferred. In fact, there is no scientific evidence that human consciousness even exists.
First; agreed; that demanding scientific evidence for God is an impossible challenge to meet. However, the opposing is also true; it is impossible to disprove God.
It is additionally more difficult to disprove (or prove) God because God falls within many definitions; and science demands clear, concise definitions of a given object or phenomenon in order to operate.
So, we can even let go of "scientific" evidence; and just ask for evidence. Even this challenge is impossible, as any non-scientific evidence for God is based on subjective opinions and personal experiences; and every subjective opinion and personal experience can be interpreted by the human mind in almost as many ways as there are people.
What most atheists claim is that as there exists no evidence for God, it is irrational o believe in this God. Thus, in order to convince an atheist that there is a god, you must do the impossible: provide evidence.
When you consider that a person's measure of reality vs. fantasy is based on evidence and that person considers evidence the highest measure of "truth" or "fact", then it is certainly
not ridiculous for this atheist to ask for that evidence as a precursor for belief. In fact, doing so is the method that most conforms to logic and reason.