That's why they explicitly stated that they are excluding charities with religious and political affiliations. But there is only so much you can do to avoid controversies - there will always be someone who want to earn a quick buck on a scandal, or sometimes someone who just wants to watch you burn. Controvery is something people manufacture. At some point you have to stop caring.
There are issues that are inherently controversial.
For example (don't hate): if you believe human life begins and has value at conception, then abortion is in the same category as murder. If you believe it begins some time later, then any restriction on abortion is a violation of a woman's control over her own body and is in the same category as rape. Those positions are fundamentally at odds, and fundamentally do not lend themselves well to compromise. An organization with activities that touch on either side of that issue is going to be controversial, not because of religion or politics or making a quick buck, but because neither side is even remotely acceptable to the other side.
There are a handful of issues that are like that. There are a handful of issues where people are unwilling to compromise even a little bit. If you casually insert an organization that even remotely touches on that type of issue into a list of 30 organizations to support this month, with no ability to skip, you lose a certain category of sponsors.
