God?
Substantially but not entirely.
If it's important to you that there is historical evidence for a belief in a god, such as a tradition related to a revelation, then the specific versions posited in the past have have been explained away, and that undermines any present reason to believe.
If philosophical arguments about what must be, such as the cosmological argument, are more important to you, then less so because the god believed in is constructed to not be falsified by present known things - but that constructed thing isn't necessarily unfalsifiable.
I am looking for examples of mysterious answers that were eventually explained *away* by science. I can think of two: One is the belief that the behaviour of living things was explained by the mysterious force of elan vital, and not by mere chemistry; which was destroyed by the synthetisation of urea. The other is the special (and mysterious) role of the conscious observer in quantum mechanics, which was explained away by demonstrating that rocks can get entangled with electrons just as much as brains can. Can anyone furnish me with other examples?
I observe in passing that phlogiston is *not* such a mysterious answer. Eliezer is down on it, but I think unjustly so; for people did in fact perform experiments on phlogiston, including the final experiment to find the weight of the phlogiston that had passed out of the burning material and into the byproducts. It turned out that the phlogiston had negative mass... in other words, that the direction of the transfer had been misidentified. But if you think of phlogiston as `negative oxygen', it makes the same predictions as modern chemical theory. This is no worse a mistake than mistaking the direction of the current, a mistake which is *still* enshrined in our sign conventions; it is not a mysterious answer of the form "X->Y" with no details of X given and any value allowed for Y.
However, I digress. Mysterious answers blown away by experiments, anyone?