I am very religious and I am a believer that there is one true god that cannot be killed, but if I am going to spend my time typing something, I dang well have fun with it.
1.First off, we must assume a god is all knowing and all seeing, which means that no matter what he can see us. That means that if any such plans will be made, they have to just be so insignificant to slip by his attention. Obviously plans to kill him would be important, so we have something that is so big that it becomes to important for the god to ignore, giving us time to plan.
2.He will obviously have power and people on his side so we would likely need people on our side. It would help to have human allies, but in the end we would need things that can fight the god on his level. I recommend other gods or get enemies form hell and demons to back you up.
3.Then you want weapons capable of defeating a god. Usually something made by him, or of godly power is the only thing that can harm a god, so get that. Maybe take it from him when his back is turned.
4.Most gods gain strength form faith and devotion; so stop people from doing that. Kill them if you have to ? you might as well because if you lose you are going to be eternally dammed anyway.
5.Lastly you need a way to get to the god. Usually thought I find it easier to bring the god down to here. To bring any general out of security, just start taking down his men.
And there you have it, a list of steps needed for killing a god. And note that this plan can also apply to taking down military leaders and next-door neighbors. I hope I helped to answer you question and have better luck when you do try to kill a god.
Note that all responsibility for any action taken after reading this post is completely the readers and the writer is in no way responsibly for the action taken. This is not a serious plan for killing a god and is in no way meant to be taken seriously. If you did, might I recommend playing God of War instead? It is a good game and you don?t have to worry about eternal damnation, which is always a plus. Still, I do hope you liked reading my comment, because I do love to make up stuff for fun. I probably need a new hobby, and a girlfriend.