Look since when has anyone claimed God can't make mistakes? Does it say God is infallible in the Bible? no it doesn't. Just because he can create the world, mankind and the like doesn't mean he never makes the odd mistake. So what if he made a triffling error with the circumference of a circle? I am glad you never marked any of my exam papers.
Actually you are wrong. The Bible says that God is infallible in numerous places - it may not use the word 'infallible' but whatever word it does use means the same thing. I think I may even have referenced a number of Bible verses when this question came up earlier but I don't have time to refer you to a post now as company is coming soon - I know that posts 388 and 643 deal with related topics of inspiration of scripture and statements that God can't lie. Here is one of the many:
Jeremiah 32:17 'Ah Lord GOD! behold, thou hast made the heaven and the earth by thy great power and stretched out arm, and there is nothing too hard for thee:'..... So tell me, do you think that a God for whom 'nothing is too hard' would make a mistake?
As far as your comment about 'making a triffling error with the circumference of a circle', go and join forces with cubram and donh and provide what I asked for in post 663.