Every computer is designed then built by someone, right?
We know that a computer has a designer because
a/ There is no naturalistic explanation for a computer
b/ We can actually meet, touch and lick a computer designer ( though knowing geek hygiene I wouldn't recommend the latter )
c/ We can go and watch computers being made and see that identical copies come off an assembly line. What we don't see is daddy computer buying mummy computer a drink and , because they didn't us a firewall, make baby computer who is a little bit different than its parents
It simply does not make sense to acknowledge that a computer needs a designer and builder and at the same time claim that a complicated cell accidentally sprang into existence.
Biochemistry is not "accidental", It inevitably produces complex products. Amino acids and other complex molecules are even known to form in space. Also nobody knows what the most primitive cells looked like. All the cells around today are the product of billions of years of evolution. The earliest self-replicator was likely very much simpler than anything alive today; self-replicating molecules need not be all that complex (
A self-replicating peptide. [Nature. 1996] - PubMed - NCBI), and protein-building systems can also be simple (
Missing links made simple : Nature News ).
And even though we cannot definitely how life first originated, this in no way degrades the theory of evolution, as it does not deal with the origin of life, just its adaptation to the current conditions.
And finally, saying that life has gradually evolved is far,far more logical than a magical, all-powerful pan-galactic being that has always existed ands stumbled around for (infinity - 6000) years before saying "let there be light"