You're missing a big piece of history. In the days of the Old Testament, God had laws, called the Law of Moses. When Jesus came, he repealed the Law of Moses. So, saying that you don't have to eat fish on Friday is not new. Also, not eating meat was not a Christian belief, it was a Catholic belief. Again, views of other Christian churches are different.

You're taking a standard approach used by most athiests. Grab what is a belief of one demonination and try to apply it to all to prove that God does not exist.

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>The word of god. Which has changed so many times that its easier to ignore than keep up with.
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>Once upon a time eating meat on a Friday was a hell worthy tresspass. Now god says "Ok, I was just fooling around with the meat-Friday thing. You can eat meat whenever you want, but not during these 40 days. If thats ok with you peasants of course. Just as long as you come in and put your money in the basket. Thats all I'm asking for. Please?"
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>After enough of that people should start to realize that the word of god is more or less the personal agenda of those in charge of the church at the time of writing.