I once read a book where the authour said if God were to arrange stars to write-"i am God and i exist" atheists still wont belive it exist because they said the arrangement is a natural phenomenom and under normal conditions it is possible. I once was arguing with a theist that said no matter the evidence they or God provides to us we would try and rationalise it way. Does it goes on to tell us that God cant really convince "we" its creation that it exist? Before you xtian theist go on to start talking about freewill. I dont think God flawlessly convincing it creation of it existence is an infringment on it freewill, cause you claim he sent his only begotten son by implication it will really want us to belive it exist, but it hasnt given us a flawless and valid evidence.