If i were a creationist, i would say, quite reasonably,
God created the universe 6000 years ago exactly as the bible/koran/etc suggests it was 6000 years ago and covered his tracks using his powers to stop meddling scientists delving into things that are beyond them.
and who could dispute that?
absolutely no one! it's completely irrefutable. So why doesn't anyone say it?
yes, I agree with you joz, God cannot decieve meaning that belief in him must be ontainable through reason, it must be possible to derive it from our surroundings otherwise he is misleading us.
but then of course, 'you cannot prove the existence of god'