why did the Bush administration violate the constitution by giving federal grants to Christian organizations?

Under the Bush administration, organizations that promote abstinence and encourage teens to sign virginity pledges or wear purity rings have received federal grants. The Silver Ring Thing, a subsidiary of a Pennsylvania Evangelical Church, has rece ived more than $1 million from the government to promote abstinence and to sell its rings in the United States and abroad. isn't this a violation of the first amendment?