Not necessarily. It says "The Supreme Court says a law school can legally deny recognition to a Christian student group that won't let gays join". The ruling does not necessarily COMPEL the school to be even-handed in who it denies, it only says the school may deny recognition.
IN the NYC area, the various MSA groups deny membership to include but not limited to:
Christians
Hindus
Sikhs
Jews
Gays
Northern Caucus Muslims