According to the Bible? In Genesis 2 and Ezekiel 37, it's rather obvious that those are not ordinary cases. We shouldn't appeal to extraordinary cases to justify murder in ordinary cases. In Job 33, the Hebrew word for "breath" is "neshamah" (נְשָׁמָה) which is the same word for "spirit", and in this case, a more proper translation would render it as such. However, even if "breath" is the proper translation, that wouldn't prove that a fetus is not a living person with a soul until after drawing its first breath, as you say, because the breath/spirit belongs to God, not to Job.
Since you mentioned Job, it seems appropriate to mention when he really thought life began.
Job 10:18 "Why did you bring me out from the womb? Would that I had died before any eye had seen me"
How could Job have died before he was alive? This is an exceedingly stupid proposition. It's evident that Job was indeed alive in his mother's womb.
I'll share a few more texts here:
Jeremiah 20:15-17 "Cursed be the man who brought the news to my father, 'A son is born to you,' making him very glad. Let that man be like the cities that the Lord overthrew without pity; let him hear a cry in the morning and an alarm at noon, because he did not kill me in the womb; so my mother would have been my grave, and her womb forever great."
Luke 1:15 "and he will be filled with the Holy Spirit, even from his mother's womb."