Well If I knew "KNEW it was god telling me to do so and KNEW god was as described. I guess I most certainly would do it. I would defer to the all knowing all powerful being that was out for the good of mankind. I would accept that my limited knowledge and defer to God.
The issue here is knowing it was god. To know it was god, you'd have to be all knowing too to not have to believe it was god and put faith in his all knowing ability.
If allowed, I would have to ask why, and what would happen to my child.
So to follow, if you knew it was god, then you'd already know what would happen to your child. You would also know god was going to ask you to do this before he asked you, so god doesn't need to ask you. As a consequence, you wouldn't have the freedom to choose to do it or not do it anyway, as that would impinge on your all knowingness.
The problem with being a know all like god is that you know everything god is going to do, has done and will do. Due to this and your inability to freely choose to do anything, you would also be all benevolent and unable to do anything that deviated from it. Also, his powers cannot break the limits of your knowledge. So, in effect, you would be god yourself.
In a bible world where the bible is proven absolute fact, where life is everlasting, death is a doorway to everlasting joy. I am not sure I really see a downside to killing. Cutting short a life to give them everlasting joy and save them the suffering here on earth would seem like a tiny penalty. Akin to heart operation.
What has the Bible got to do with this, btw? If you read the OP, this discussion was with a Muslim.
Anyway, in this world, nothing is a downside as everything leads to this "everlasting joy". This means morality vanishes due to only good stuff happening, and therefore the term "all benevolent" becomes meaningless.
Would you object to removing cancer from a child to give them a full life. Even though the operation will create short term suffering? Would you suffer your child an antibiotic injection to avoid creating short term pain to allow them to live a comfortable remainder of their years. Life is less than a blink of the eye when thinking of eternity.
This doesn't work as an analogy because we are having to remove the idea that we know this "everlasting joy" exists and therefore our concept of morality too.
If I'm going to answer this void of that, then yes, I would do it because it means they get to live longer in the only existence I know they're going to have.
In a world where the bible is absolute fact, I would absolutely kill the kid? Why shouldn't I?
Again with the Bible.....
Anyway, as I've explained, you would because you have no choice.
Kid enjoys everlasting life
kid does not need to suffer pains of life.
kid enjoys everlasting extacy (and need not wait)
Gods good plan is executed to the betterment of humanity and the universe.
kid does not get to enjoy the blink of existence we call life. (irrelevant in the grand scheme)
kid does not get to enjoy the minor joys of living out life. (irrelevant as the alternative is better)
I will feel sad that I no longer can enjoy the kids presence in my life. (not a good reason to disobey god, it would be selfish to use this as a reason)
There are no pro's and con's. Everything is neutral and amoral.
In a world where bible is absolute fact I have to obey god. Who would I be to question an all knowing, all benevolent, all powerful god?
Seriously, enough with the Bible. I don't know why you seem to have jumped to it by default....
You wouldn't be one to question god because you wouldn't need to question god, as for you to know it is god rather than just believe it is god, you'd have to be all knowing too, as that is one of his attributes. And as it goes, god wouldn't need to question you either because of this, so as an overall conclusion, god wouldn't ask you to kill your own kids.
Perhaps I should say similar to my ex-neighbour....