Any story of man’s origin is going to be an article of faith, since there are no eyewitnesses and no film.
There are rocks and bones and tools.
But your point is valid, if you go back far enough at some point how things got started is an article of faith.
BTW, even Darwin avoided that question, his book 'On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life' specifically does not address the origin of life itself, only how existing lifeforms adapt to their changing environments over time.
Science addresses how something happens/happened. Religion addresses why...