only allow bio fuels and alternative energies
These would require first the technological ability to use them and the industrial capacity to produce them. Which in turn requires the education and knowledge, not to mention the pratical equipment, to use and produce those technologies.
denounce all gods and proclame my self as the one and only god who does not want to be worshiped and who wants you to follow all laws
Or you could just demonstrate that following the laws is good for the people. Making them want to do it results in them actually doing it more often than simply ordering it.
Declaring yourself the one true god is entirely unnecessary in any case.
stop the overpopulation of the planet before it begins using simmilar methods china uses to keep the population somewhere arround 1 billion
Or you could teach people why overpopulation is a bad thing using realistic examples from the present. Once again, telling them to do/not to do it isn't enough; what happens once you die? they'll go back to doing what they want.
You have to show the people why to do something; telling them what to do doesn't work, as most of history can attest.