YMMV...
It sounds like you may not be certain of the true nature and history of the entire international organization. From what you have seen locally it appears to be harmless and even charitable, of course there wouldn’t be the slightest hint of anti-christian taint but you probably didn’t throughly read the information at the link I provided.
If you want to know the Truth, I suggest you study your faith, put down your bias and research the issue until you are convinced of what you now may only suspect.