Like Jeff, I too would embrace god if he manifested himself in some unmistakable way - and by that I mean a way that is unmistakable to me personally. It's not that I think I'm special, because I realise how terribly insignificant I am. And perceiving god in a daffodil doesn't count, because I look at a daffodil and I see a product of natural selection. I might cite the resurrection of my parents as a good example of something unmistakable to me personally. Do that, god, and I will prostrate myself before you, but I will still wonder why it was necessary for them to die so horribly.
While I acknowledge that there is a small minority of scientists who are also theists, I have yet to see any of them put forward a solid scientific argument for the existence of god. While their arguments have at time masqueraded as scientific - I cite for example the multiple failed attempts to demonstrate ID - in the end they are all without exception philosophical, and philosophy does not constitute observable, measurable evidence, as convincing as it can be. A good example of the phenomenon is Bertrand Russell's revelation as a young man that the ontological argument for the existence of god was sound. Himself a Nobel prize winning philosopher and agnostic, he would come to realise that he had been merely caught up in a philosophical paradox. In 1946 he would write:
"The real question is: Is there anything we can think of which, by the mere fact that we can think of it, is shown to exist outside our thought? Every philosopher would like to say yes, because a philosopher's job is to find out things about the world by thinking rather than observing. If yes is the right answer, there is a bridge from pure thought to things. If not, not."
A philosopher, as has been defined by others far more intelligent than I am (including philosophers themselves), is someone who won't take common sense for an answer. It is in some ways a compliment. In others an acknowlegement that what they have to say exists only in thought and what exists only in thought cannot be observed and measured and, therefore, does not constitute evidence.