Care to name something that is natural but can not be observed.<quoted text>
How do you know that?
Counting individual snowflakes is not the only way to measure them. For example, you could weigh individual snowflakes and come up with an average.Snowflakes is observable but not measurable, but exist nonetheless.
Incorrect. For one thing, one can observe and measure the gravitational effects around the black hole. For a second thing, one can see the jets coming off of the disk of matter falling into the black hole. For a third thing, one can observe the Hawking radiation.Black holes are not observable OR measurable, but exist in nature.
Again, one can observe and measure the brain activity of a sleeper.Dreams are not measurable, but they exist.
"Believing" in DNA before it was observed would have been irrational, even though it turned out to actually exist. Believing in Bigfoot is irrational. If evidence of Bigfoot were to come to light, THEN believing in Bigfoot would not be irrational...but not before.(And, no, Buck is not evidence of Bigfoot.)DNA is only recently observable, but it existed without our knowledge of it.
Why do you give such criteria to God but not to other things?
Your thinking is rather limited. Likely, you have never had to consider the nature of observations and measurement.
Judging from your earlier posts(referring to things like dark matter), I think it likely your position is..."I don't believe in anything until I lay eyes on it, except for God."