"Are you selective about which charities you give to, or do you look up "charities" in the yellow pages and give to every one of them?"
I am selective and only give to local charities I know do good work. One is the non-denominational food bank and their clothing program, and the other is a spay-neuter program for cats.
"There's nothing wrong with deciding that you will give to some but not to others, especially when your decisions are guided by the leading of the Holy Spirit."
I agree, but the issue isn't whether we give to this charity of not, it's the general concept of Christians working together, overcoming differences for the greater good of Christ.
What if you prefer not to give to charities which you aren't sure *are* Christian, again due to the leading of the Holy Spirit?