If anything, I think the equality in everything but name is even more insulting. It's like, "Hey, you've proven you meet the minimum threshhold for there to be a societal interest in giving you equal rights to heterosexual couples...but we're going to make sure you'e discriminated against anyway."
It's not meant to be discriminatory. It's giving them equal rights without redefining a religious term.
Marriage is not a religious term. No Communist state, no matter how militantly Atheist or Totalitarian, no matter what other traditional social structures they sought to uproot, ever attempted to abolish marriage.