bex,
people likely were planting crops before the invention of the calendar but i bet the success rate of the crops was increased by using the stars to figure out the correct times to plant them. you say it is second nature, but i sincerly doubt that is to be the case. if you get a warm front in january and plant your crops and get a freeze in february they are going to die. we know that, and they probably knew that. but how do you know that a particular warm spell is the first sign of spring and not a fluke during the winter. the same idea will apply for all seasons. also, isn't a theory for why tribes were small before civilizaiton began because of the difficulty in having enough crops to feed a larger group of people?
as for the mesoamerican monuments, a lot of information from the past has been lost. today, people study these things and make theories from where they come from. i don't think that the claim that they were built by the gods and the fact that we haven't discovered evedence of who built them means that they were in fact built by gods.
for my ingorance on the sumarians, i don't think that i can sit here for an hour with a few google searches and learn what i would need to know in order to understand what scholars spend their entire lives studying. i see a sun and several spots circling it. it looks like that could be an idea of 11 planets (or whatever, since i think you said the moon was included in their planets). but i don't think that is the only explanation. it could be five planets and their six favorite stars. again, an google search is not going to give me what i would need to interpret this fairly and form an opinion.
for the egyptians, they claimed to be god. years later the european moncarchs claimed to be appointed by god. it is not a unique idea. did they have power before, certainly. they ruled empires. but it certainly is more difficult to oppose a god or an appointee of god than just a guy who became leader. the more awesome you can convince someone you are the more likely they are to follow. "you there, build me a pyramid". "but pharoe, i am going to die". "yes, but i am your god, who are you to defy me?" goes a long way. just because it was claimed at the time does not mean that it was literally true.
so, the rocks again. i don't think this issue is really resolvable. i argue that you get enough people together you can get big rocks moved with the limited tools that they had at the time. today, could we get 1000 guys together to move a 100 ton rock up a mountain. probably. would it be easy? no. do we know how? no, we are out of practice with that sort of thing. could we figure it out. i bet we could. forget moving them for a second. i have more trouble figuring out how they cut out nice little 100 ton rectangles from the quarry. moving it seems easy by comparison. but i still don't think that means people couldn't do it.
people today are still convinced their gods have visited them and are waiting for them to return. people over 2000 years after christ, have never actaually seen christ or anyone who has seen christ. but they have faith that he existed and will come back for them. people's beliefs do not offer proof of christ, they offer proof of faith.


Do some research on the Mayan Calender,the Hopi Indians etc. You don,t expect everything just handed to you or do you ?Read Zachari Sitchens last book ,if thats to much to ask then read the summary in his last book .Thats only a couple pages you should be able to handle that.

Here is the cylinder seal i mentioned.
Notice in the background a sumerian depiction of the solar system with 11 bodies orbiting the sun.