(CBSNEWS) — During church services on Sunday, Catholics around the country were read a blistering letter assailing the Obama administration for an “assault on religious liberty” in the form of a coming requirement that most church-linked organizations – among them hospitals, schools and universities – offer birth control coverage as part of their health care plans.

Despite strong lobbying from religious groups, the Health and Human Services Department announced earlier this month that most church-linked groups will not be exempt from the requirements – which also mandate that no co-pay be charged for contraceptive services – though they will have an extra year to comply beyond the August 1 deadline.

Churches themselves (along with any other employer that is explicitly focused on offering a religious message, and which primarily employs those who believe in that message) are exempt from the requirement.