<< Life, is my passion. >>
It looks like you're contradicting yourself here, Gotsmack. If you realize it, there are millions and millions of innocent children, and according to this question, would die if one child kept his/her life. It's a given that any one of us would do everything in our power to make absolutely sure that the deed must be done before commiting to it. But this branches out and conjures up several other questions such as how long do we have to decide and/or take action. So sticking to the hypothetical at hand, it should be a nobrainer to save humanity, all other aspects aside. If you want to get down to it, think of the kid's future had the rest of humanity perished. He or she would be alone. Would not be able to procreate. Would just die a lonely young & confused person. I think that's more cruel than saving his or her life and letting the rest of mankind being dead.
My .02