As far as I know, all the main religions have a command saying do not kill, all countries have a law saying do not kill. So whatever false religion or false nation you belong to, you should still not commit murder.
There are plenty of people who think their God wants them to kill or harm or hate people, be it Isis types telling thinking God tells them to kill the infidels, be they distraught parents who kill their own children thinking them possessed by demons, or be they other parents denying life saving medical treatment (such as Jehova's Witnesses in regard to blood transfusions) or standing in the way of research that could save millions (ie, stem cell research). There are more who preach hatred, but not killing, because they think God tells them to (Fred Phelps' types), and more who think other destructive behaviour is instructed by God.
They may all be completely wrong and misguided, but they believe, and they use the same logic as above... And indeed we have had people in this thread outright state that if God wanted them to kill people, they would kill people.... So no, you don't get to pretend that God belief is all peace and roses. And it is crystal clear that people's obedience to what they think are Gods cause horrible tragedy, no matter how much you and others here want to avoid acknowledging it.
Of course people do horrible things for other reasons than religion too, and they rationalize it and tell themselves it is right, etc. But they can't do that in quite the same way as when they think a God has told them to do it, absolving them of any personal responsibility to think it through for themselves, making them think it is right (because they think God knows better) even though it appears clearly wrong to them, and removing themselves from any ability to reason with them (since they have abandoned moral judgment making in favour of their God).
On the other hand, you say you choose the laws that you want to obey, you weigh them up with your own brand of morality. This implies you have a higher regard for your own brand of morality, than you do for Canadian morality. If you want your freedom to obey the laws that suit you, then you have to accept that every Tom, Dick and Jane can make up their own laws to suit them. Just imagine seven billion people making up their own laws, the law would become a free for all, and there would be no law or authority worth following.
Only if morality was totally arbitrary. In reality, most of us agree on what moral values are, as you noted above, because we have as a species evolved senses of empathy and fairness. Most of us know that killing isn't good, for example, except in very particular and extreme circumstances. And we shape our societies with ethical reasoning based on those senses and on social contract and utilitarianism.
It is our guard against those who would be tyrants and seek to rule over us, including those who seek to do it with the greatest tool ever devised for it: religion. If they can shut your ethical reasoning down, telling you to do what they say God demands of you, then you become their tool, and that is a shame. That is why statements like we have seen in this thread are scary.
Thankfully, I don't think that has happened to you, or to many religious people, which is why we see so much disagreement among you and selective readings of your holy books, ignoring the bad and embracing the good. The book says that God demands both nasty things and good things, but you ignore the nasty and explain it away with convoluted mental gymnastics... because you already know what is good and what is bad, and didn't actually need a God to tell you, just like me.
Most city dwellers are squeamish when it comes to the slaughter of animals, we like to see our meat nicely displayed in butchers shops without all the gore. The halal way to slaughter animals was written fourteen hundred years ago, before electricity was invented, I believe it to have been the most humane way to slaughter animals when there were no stun guns.
So you don't think it is the most humane way today? We do have stun guns now, and people continue to do it because of obedience to ancient religious directives. And actually, I think that we will someday look back as a species in shock and horror that we used to be so barbaric as to eat other thinking animals. Especially as it becomes easier and easier to avoid and still be healthy.