I don't consider anything beyond the facts and what's scientifically provable. Someone like you can chalk it up to dumb luck that the facts almost mirror exactly what the Bible claims about it. Unlike you, I know that the leftist mantra of "follow the science" is as stupid as blind devotion so some cult religion. Science divorced from morality and ethics is about the purest form of evil on planet earth. Through it you can justify just about anything, and leftists have done that throughout time. We all know their names.
About twenty seconds after fertilization (20 seconds post "the moment of conception") the zygote develops Cell Differentiation wherein the RNA forms a unique DNA and the cell is able to divide in a very specific way. Upon these first divisions the zygote becomes a blastocyst, and it is this point where we can scientifically prove, unequivocally, without any reservation, that this is a unique human being possessing the entire biological functionality of a human being, with his or her own unique DNA, who is merely at the earliest stage of development. Any other bullshit leftist definition of "person", "life", "human", or "human beings" is a version of one lie or another and is scientifically disprovable by a simple map of the human DNA. Sperm and Egg are cells belonging to a unique and specific human. Conception is imprecise, as differentiation and creation of a human being takes place just after conception, and we all know how you fucking bastards love to play with words to obfuscate the truth. Heart beat is entirely irrelevant. Birth is entirely irrelevant. That you want to focus on these things and not the scientific facts is telling.
That you don't know this, or reject it and think you can just make up your own definition of "human being", "life", or "personhood", pretty much tells us all we need to know. You believe you create your own reality, and therefore you cannot be one of us. You don't get crimes against humanity by speaking the truth. You get them by arbitrarily determining who gets to be a human being, and upon who is conferred personhood, and the protections of the state. Virtually every crime against humanity involves the self deception you have on display here.
To say that this rejection of reality, and the demand that we all participate in it through force and murder, does not lie at or near the root of your mental deficiencies probably misses a lot of what is wrong with you, and your miseducation.