No offense taken.
I am thankful that it sparked your curiosity because that is my greatest mission.
My rationale for tithing is simple: The money that my little church receives through tithes helps an average of 140 kids get to and from the Wednesday night youth/children services and gets them to and from church on Sunday morning. These kids are the ones that don't make it to school or have parents with cars or the inclination to take them anywhere.. That money pays for summer camp and missions trips. It pays for helping the little old lady whose husband died when he turned his tractor over. That money bought food for 4,000 plates that we gave our time to cook and deliver after hurricane Katrina. There are lots of other things that money goes to that will take too long to list; but the gist of it is that I give that money to an organization and ideal that is centered around exposing others to something that is greater than the good that can be bought with money.
But, I also give a pile of money to St. Jude's because an amazing group of people work there they were incredible to us when we needed them.
I have always donated to a few other charities too; but in smaller amounts.
Good for you man. It's always great to hear about people giving back!