Same-sex marriage and sacramental unity

In 1963, William Stringfellow - movement theologian, Sojourners mentor, and gay man - had the following to say about mainline churches who were pondering whether to join the struggle for African-American civil rights:

The issue here...is not some common spiritual values, nor natural law, nor middle axioms. The issue is baptism. The issue is the unity of all humanity wrought by God in the life and work of Christ. Baptism is the sacrament of that unity of all human life in God.