@jaketheripper, the most embarrassing one is the difference between Genesis 1 and Genesis 2. Genesis 1 says God creates plants and animals before humans. Genesis 2 gives the opposite order.
Other numerical contradictions:
• 2 Sam 24:9 lists a different census count (800,000/500,000) than 1 Ch 21:5 (1,100,000/470,000)
• 1 Kings 7:26 says Solomon’s palace held 2,000 baths, while 2 Chr 4:5 says it held 3,000.
(There are a bunch of such numerical contradictions between the Deuteronomistic histories and Chronicles).
In the synoptic gospels, Jesus is reported as going to Jerusalem once; in John he goes there three times.
Here’s a huge list of them:
http://www.infidels.org/library/modern/donald_morgan/inconsistencies.html
Note that this doesn’t disprove “God” in an abstract sense, or even in a liberal Christian sense. It just disproves a god who is defined as inspiring an inerrant Bible.
That said, the concept of the Trinity is a mathematical contradiction. If you believe that God exists as a Trinity you have to disregard mathematics and say it’s a “mystery” that supersedes human logic.