Evidence for BB is more than compelling.. but you need a bit more than everyday math to understand why (it is compelling).
Recently, Coursera.org offered again Dr Plesser’s course (Introduction to Astronomy), which I highly recommend to anyone – it is actually very easy to understand everything he was talking about, even math.
The fact that BB was proposed by priest (Lemaitre,
http://en.wikipedia.org/wiki/Georges_Lema%C3%AEtre) is not important here.. I am pretty sure he himself was not very happy about the whole idea
