I could say "None of us have any way of knowing, if there isn't, so be it."
...and which one of us will be sorry if we are wrong.
While it's reasonable to state that we finite creatures do not have the independent capacity to reveal the infinite to ourselves, it is nonetheless entirely logical to presume that if a supreme being possessing intelligence and personality exists, such a being would not only be able to, but likely would, reveal himself to the lesser beings he has created. And that's exactly what many of us believe has happened as recorded in various religious writings. Then it becomes a matter of investigating specific incidents and determining whether the accounts are credible or not. In any case, it's an intellectually lazy argument to say "nobody can know," and sit back on one's ego.
And of course, aside from the matter of a personal god revealing himself, there is an abundance of inferrential evidence found in the complexity of natural processes which we observe. Chaos is not so clever. Those determined to inexplicably put man in the position of being the biggest and best intelligence in existence will jump through countless flaming logical hoops and circular scientific arguments in order to achieve that end, so any evidence of a greater being not only is, but MUST be dismissed.