This is a topic that has interested me for a long time and I believe I have something to add to this thread.
Maths does prove God exists, in a cumulative sense. You might say that the laws of mathematics are the skeleton of God and the love of God puts flesh on those bones, breaths life into those equations. Another poster linked to a video about the Mandelbrot set. The set is based on fractal geometry and God's word, the Bible, is founded on mathematics and features fractal geometry, in particular a well-known fractal known as the Koch Snowflake. Here is an example:
In classical antiquity letters doubled as numbers according to well-established numeration schemes. The Greek word
Logos, 'word', has a numerical value of 373, which can be rendered as a beautiful fractal snowflake, which is the second iteration of a Koch Snowflake beginning with a triangle. Here it is.
Although I wouldn't say maths in and of itself proves God exists, I can show you without much difficulty that God's house is built on the rock of mathematical truth.