Unfortunately (or not, depending on your point of view), if you have a few dollars and an internet connection, you can become an ordained minister.
(http://www.ordination.com/) is just one of the many websites that will ordain online. As far as being registered with the IRS, he could file under his social security number. If you are wanting to do a tax deduction for donations you made, you may not need the id number depending on the amount. I would consult with your tax accountant to verify.
Please let me know if I can help further.