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"And if men struggle and strike a woman with child so that she has a miscarriage, yet there is no further injury, he shall be fined as the woman's husband may demand of him, and he shall pay as the judges decide. But if there is any further injury, then you shall appoint as a penalty life for life, eye for eye, tooth for tooth, hand for hand, foot for foot, burn for burn, wound for wound, bruise for bruise."
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That's really the closest thing to a reference to abortion in the bible, and clearly, only the woman's life is considered true human life. The destruction of the fetus is only worthy of a fine, while harming the wife demands "eye for an eye" revenge. Using this example as a guide, if a fetus is "innocent" it's only because it's not a human yet.

And surely you don't actually believe that homosexuality will EVER lead to the extinction of the human species. Look around you: there's no shortage of humans. If half of the world population turned gay tomorrow, the human race would still survive.