The Michael Horner website is indeed interesting - and sort of funny. This person seems to be not unintelligent, but he apparently never looked into any mathematics or physics book that was written later than the 15th century.

His "god proof" was from Thomas Aquinas. His "thermodynamics proof" just proves that he has no clue about thermodynamics. And his green book "proof" of the impossibility of infinity was already made fun of by Galileo Galilei in his fictional dialogue with the dimwit "Simplicio", in the 16th century.

http://en.wikipedia.org/wiki/Galileo's_paradox

As to the question about the Big Bang and the infinity of the universe:

Some people seem to assume that "Big Bang" means the universe sort of exploded from a point. However, nowhere in the Big Bang model you'll find any assumption about the initial size or previous history of the universe. Nowhere does the theory claim that time and space began with the Big Bang. It's quite likely that the universe was already infinite at that time. The Big Bang affected only the density and temperature of the universe, but not necessarily its size. If you multiply infinity with any expansion factor, you'll still get - infinity.