the majority of scientists are in no way religious, and scientists will not accept anything as fact without evidence. so to say "Scientists hold a religious belief (unsupported by evidence) that life began in primordial seas" is just not true.
an experiment back in the 1950's by Stanley Miller and Harold Urey where they mixed a chemical solution of methane, ammonia, hydrogen and water in a flask, which is what the earths early atmosphere and seas were theorised was made up from. They subjected it to an electrical charge and the results was they produced organic compounds including amino acids in the flask. As amino acids are the building blocks of DNA it suggests that this is how life began.
this is enough for most scientists to accept that that this is how life most probably started and with no theories that have been demonstrated to indicate otherwise it is reasonable.
If any evidence to the contrary is ever presented then, be sure that because of how science works, scientists will adjust what they accept to be true.
keyboard, because in most cases if you hit a keyboard with a lightning bolt you could produce a new string of biogenesis .