Doubter: For those trying to prop up the Mormons and SDAs for their alleged giving back, it stands to reason that social programs are being funded by the government, not tithes:
That statement seems to be nonfactual. None of the links you provided show any statistic regarding the funding source for charitable arms of said churches. The church itself says none of the funding for it's charity comes from government grants. LINK: https://www.ldscharities.org/pages/about-us
Please clarify your sources