I don't think there is even any scientific doubt that a fetus is a biological human. I think the question might be at what point the biological human achieves human conciousness. Science can't answer that one as much as they try. I for one would be horrified if one day we found out that human consciousness is achieved very early in the development and we've been killing them anyway.
And no, this is not a faith issue. Anyone who throws it that way (Clyde) is trying to avoid the actual argument.