This is one of the reasons some atheists such as Anthony Flew eventually accepted God as a first cause, as initial inception explanations of matter then life how life got started amounted to a spontaneous appearance by the combination of time and coincidence.
if you wait long enough a big bang will occur manifesting matter where there was nothing before ,
if you wait long enough the inert matter will combine into stars and planets
if you wait long enough complex molecules will combine producing life that will evolve
if you wait long enough evolution will produce persons reading arstechnica.com on cell phone screens while riding the subway to work.