Evolution is a long and brittle chain. For the atheist, every link must be strong and true - else the "God of the gaps" will leak in. Not that I am a fan of the "God of the gaps". But, it should help some atheists to see the futility of their problem. Thousands of smart people looking for decardes for some way to deny God (some ignorant, but many are intentionally searching for an alternative to God). But this is the best they have...
I have discussed the problem of the as-yet unknown atheistic explanation of the origins of life. I have also ridiculed the notions of macro-evolution (the assumptions of common descent and the transmutation of species).
But there is also the problem of "stellar evolution". This is the process by which clouds of hydrogen (the initial product of the Big Bang) becomes the first generation of stars. These stars are believed to have been short lived, and formed the heavier elements which make our sun more stable (and thus, longer lived).
Only one problem. There is no model by which hydrogen will form a star! (without the magic of dark matter)
This is a subject which is rather interesting to me, so I will continue to investigate. There is a apparently a "Millennium Simulation Project" which has a lot of relevant data.