Well, first of all, if Clinton is a Christian, he is indeed Bush's brother in Christ, whether you like that or not. Second, I took it more as a joke - you know, kinda like the elder Bush is "adopting" Clinton and that makes them half-brothers at least. Perhaps something else beside the "brother" remark is setting you off?
Whether Bush was making a joke or not, the fact remains, Clinton has been treated with more respect by the Bushies then he deserves. You have no problem with that. Gotcha.
That said, the Clinton Library is not far from my house, and they'd have to drug me to get me to step foot inside of it.
sw