Incontrovertible Scriptural Evidence
In response to: "If you can provide me with clear, incontrovertible Scriptural evidence that life begins at conception, I will believe it."
You don't need clear and incontrovertible scriptural evidence. Your standard for ethical judgements should be (and, I'm sure, is) something more like 'consistency with principles drawn according to clear and incontrovertible scriptural evidence'. If you were to take clear and incontrovertible scriptural evidence as your only standard for making ethical judgements, you would be left quite without support for a number of judgements I'm sure you already make.
I could name a dozen, but one should suffice. If you were to find yourself in Durham, NC in the year 1800, somebody might well say to you, "If you can provide me with clear, incontrovertible Scriptural evidence that the African race is human, I will believe it." You would find it very difficult to give them what they want. The African race is not mentioned in scripture.
In fact, you believe that black people are human because it is consistent with principles drawn according to clear and incontrovertible scriptural evidence, not because scriptural evidence exists for the position itself. And that is a perfectly valid reason to hold an ethical judgement of that kind. Scripture was never intended to give an answer to any particular ethical question the human race can come up with (It would have to be infinitely long!) - But it provides us with some trustworthy principles from which to reason ethically.
BUT, despite the fact that no direct scriptural support exists for the position that life begins at conception, I can give you a few verses that strongly imply it. These present the speaker as having been, in the womb, a separate, unique, important, differentiable human being in the eyes of the Lord.
Psalm 139:13
For you created my inmost being; you knit me together in my mother’s womb.
Jeremiah 1:5
“Before I formed you in the womb I knew you, before you were born I set you apart; I appointed you as a prophet to the nations.”
In the eyes of the Lord, the fetus is a different person from the mother.
In any case, the question of whether life begins at conception isn't even the current state of the argument. The conservative side won that point ages ago. The current state of the argument is to question whether personhood and rights begin at conception. This guy's page pretty much sums up the current state of the pro-choice argument.
I'm not going to give any actual arguments at this point, since that's not what you asked for. But I will leave you with this: The history of the last two centuries is in large part the history of the idea of human rights. Various questions arise, are resisted, and then are finally answered. Are peasants fully human? Should they have rights? Are non-whites fully human? Should they have rights? Are women fully human? Should they have rights?
It seems like a good idea to be on the "yes, they are human, yes, they have rights" side of things rather than the "no, they aren't human, no, they don't have rights" side of things.
Yes, I will be on the pro-robot rights side.

