I see. . .so the theory of evolution just jumps over to existence of a life form.
So are you saying that, for a doctor to treat you, he/she must believe that a single celled organism evolved into a multi-cellular organism with different DNA?
That still seems to be very strange criteria. I don't see a connection with believing that and the knowledge/skills required for a doctor. If you feel otherwise, please explain what impact you see.
In the sense that the theory of gravity just jumps over the question of where matter came from, or electric theory just jumps over where the first electron came from. Science can explain some things, but not everything. The fact that we can't explain where electrons came from or why they have a negative charge doesn't mean that we can't build an electric light.
I am a theistic evolutionist. I believe that, in the beginning, God created the heavens and the earth, and that in due course he created life, and eventually gave me a soul which-- to quote the Talmud-- I will someday have to return to Him, and give Him an account for how I used it.
I have little use for "scientists" who use what we do know about the world to make giant unsupported leaps into what we don't know, and argue that there is no God and life arose from nothing. Such fools are, in fact, a small minority of scientists, although they are disproportionately represented in the popular press. (Real scientists are too busy publishing in scientific journals.)
That does not mean, however, that we don't know certain things with reasonable degree of certainty. Some of those things, supported by mountains of evidence, are that the earth is billions of years old; that life is, at least, many millions of years old; that all living things now on earth share a common ancestry; and that different species arose from a process which includes imperfect reproduction and natural selection, though it might also include other processes not yet fully understood.