Not so. It is true that there is much debate about how life actually started, but once it had started, then a great deal has been discovered and understood about how it has continued, in many unbroken lines, since those first cells divided and then continued to divide. There may well have been many false starts of course, but we don't know.Quote
We have NO knowledge of how life can arise. So naturally, evolution is not understood. EVEN if we steadliy learn.