If God asked you to sacrifice/kill your son to prove your love for Him. Would you do it?
Sticking strictly to the question and assuming God did in fact ask such a thing then I would have to say that I don't know. I would like to say that I would but I don't think I can honestly answer unless I was actually in that situation. It's sort of like asking if I would deny God if I were being tortured. Hopefully I wouldn't but I cannot say for sure what I would do.
But you believe he asked Abraham to do it, right? So it can't be that weird for you.
This question strikes at one of the core objections we non-believers have with your theology - namely that just because your bible (i.e. - your god) says something is right, doesn't make it right. This is sometimes referred to as the Euthyphro dilemma. Is something morally right merely because god commands it, or does god command it because it is right? If something is moral merely b/c a dictator says so then there is no objective morality b/c the dictator could change it at anytime. But if the dictator commands something b/c it's moral then objective morality exists without the dictator - at which case the dictator is also subject to the moral law (i.e. - he would be acting immorally for asking you to violate it).
In response to your response, you don't know? Really? Would you give in to a murdering monster if he wanted you to exterminate a specific race of people in a concentration camp? There have been many cases where people have gone to prison for slaying their children b/c they claimed god told them to do it. Would you say that absolutely none of them actually got the command from your god? If so, how can you make that claim when your own bible clearly depicts not only god commanding a man to slay his child, but also commanding (allegedly) the slaughtering of hundreds of thousands of people (see 1 Samuel 15, etc)?
But here's the absolute worst part. You say, "I would like to say that I would...[obey the command and slay my child]"
WHAT!? Are you serious? You would actually LIKE to say that you would obey a disgusting, vile, dictator? This makes you completely immoral - and really incapable of evaluating and/or making your own moral judgments. Furthermore, if you cannot evaluate whether or not the things in your bible are actually moral or not (b/c you are supposedly 'fallen' or whatever) then how can you make the moral assessment that your god is moral?