We got to the Moon on such "assumptions". Our military is the finest in the world because of its technology because of such "assumptions". Our weather reporting system, high level of technology (do you have a computer, an iPod or cell phone?) because of such assumptions. Is it so hard to think the same people who built your MP3 player are stupid about dating rocks? It's science. Scroll through links at NASA - Home
Go out tonight and look at the Moon. What time is sunset where you are? Don't know? Go here Intellicast - Local and National Weather Forecast, Radar, Maps and Severe Report How do they know what time sunset is? How does NASA know the Moon is going to be a little bigger than usual tonight? Because of the Scientific Method. Science is a tool of knowledge. Please don't deny it.
If you believe in God and you believe God gave us brains, then doesn't it fit that God expects us to use our brains and study the Universe which was created?