Some things:
1) Dave Ramsey here at Letsrun is not me -- completely different guy.
2) Dave Ramsey does NOT tell people to give 10% to their church. He says that he gives 10% to his church, and he helps people figure out how to do it when they call and bring up that they want to, but he says it's a personal decision.
3) For people who have problems with debt (and if you have credit card debt, you have a problem), having them pay off the lowest balance first is a good idea. Can't be righteous all of a sudden if you have multiple lines of debt. You pay off the lowest amount first to see progress and get it gone and then use what you would have paid toward that debt to attack the next largest one. Now, if you are someone who has their sh!t together and for some reason finds yourself in a situation where you need to pay off someone else's debts (helping them for example), then by all means go after biggest interest rate first...but YOU don't have a problem with debt in that scenario.
4) Dave Ramsey suggests a 15-year loan, and he says you are not in position to buy a house unless you can comfortably afford a 15 year loan (no more than 25% of your income going toward mortgage). I don't necessarily agree with that, as I think it's ok to have a 30-year loan, but it's not bad advice...makes people a little more prepared and aware before buying a house. I do NOT agree that you get a 30-year loan with the plan to invest the difference, because that just doesn't usually happen. Instead, plan to invest 15% MINIMUM of your income for retirement, and then if you can, get a 15-year loan. The ultimate goal is to retire with ZERO mortgage (owning the house ourtight), ZERO debt, and a sh!tpile of money.