As a member of our Parish's Life Chain Committee, I can assure you that the vast majority of the local non-Catholic churches disagree with that. Two years ago the Southern Baptist minister who had in previous years signed the joint letter backed out because his fellow ministers directed him to do so. One other prominent Baptist minister told the committee that they would not participate in such a hot button issue because congregants would withhold donations and the pocket book was the bottom line.
The many of these same churches are participants in NY Yankee pitcher Andy Petite's little Youth Explosion shindig that he purchases for city.