The fundamental flaw in this is that, while it may be possible to philosophically define life as all activity(and certainly religiously possible), we cannot do so scientifically. When I last looked, there was at least some debate over the scientific definition of "life", but it generally referred to self-replicating organisms. In other words, if something cannot act by itself, (such that, in order to be active, it needs an external force) it is not considered alive.
While I could see a possible counter argument being that we need food and water to remain alive, the problem with such an argument is that we need food for our maintenance of life, not beginning it. While I don't know the exact details (so if I'm mistaken please correct me), from what I understand, the process of life beginning in the womb is a combination of two other living cells (egg and sperm) working in conjunction with each other to combine into one life, so it's not quite the same thing.