Imagine that recently a man revealed himself to be a superhuman being who is many a millenia old and still retains his perfect physique and mental health. He appears as a man in the prime of his life, he stands seven and a half feet tall with white but tanned skin and thick black hair. He claims he started all the prominent religions of the world as experiments earlier in his life. He says he was what we call Abraham, Jesus, Mohammed, Buddha, all the key human figures in the popular religions of the day. He has since decided religion is useless and only a detriment to human kind. He possesses superb psychic abilities and can destroy a man with a mere glance, as well as see into the future. His intellect is unimaginably powerful. He can survive from things that would kill a normal man a hundred times over and does not age, being several thousand years old already.
This man wants to unite all of humanity and establish a one world government that he rules as the supreme leader, the Emperor of Mankind. He claims he will establish a government based on the principals of science, space colonization, and the advancement of humanity in general through genetics and technology. His supreme goal is to establish the Milky Way Galaxy as a galaxy wide human civilization. His empire will be atheistic and he is adamant that he himself should never be worshiped as a god, rather that science prevail over all. He is not opposed to violence in the least bit, and his future empire will use violence to suppress heresy and unruliness if it comes to it, but he has the betterment of humanity as a whole on his mind.
This man already has three billion people as his servants, entire countries including China, Japan, UK, and all of Africa completely pledge themselves to him, giving their entire arsenals of weaponry to his cause. So here is what this is coming to, the question. Would you pledge yourself to this superhuman man bent on establishing an empire with himself as supreme leader? This would entail you doing whatever his current empire calls for, be it military service or engineering or what have you. If you ally with him you will potentially be killing people you would have never turned on in an older war that was country vs country. Americans will have to kill Americans, French will kill French, etc. Or will you resist his rule out of resentment for a dictator like government or whatever reason you might have? If you resist, you will also have to fight your own people and if it came down to your side losing, the emperor would have people judge you to decide if you accept him as ruler, and if you truly don't you will be executed.
Question is in the final paragraph and is bolded but please don't just read the question and give an answer, knowing who the man is is an important part of the question. And yes you 40k fans, you don't even need to point it out=].
I never expressly stated that I am talking about 40k's Emperor of Mankind, so don't hate on people who are responding to the question without him in mind.