Discrimination against those who believe something else? It is a currently very common attitude that "sincerely held belief" is enough to make something [slavery, murder of indigenous people, keeping women down, etc.] right, and that pushing against its ruling other people is persecution and anti-Christian and thwarting their Constitutional right to believe what they want to believe [and have those beliefs encoded into law for the "all of us" to follow].

"Redefine marriage for all of us" — who is doing that and how? There are two types of marriage: civil, to promote households in the interest of the State; and religious, to sanctify according to one's specific religious tenets. A marriage license to establish a joint household wherein the parties rely on each other before needing to rely on society for support applies to the civil recognition of a union. It is religion agnostic as it is a law, and we supposedly have "equal protection under" it.

Apart of the civil aspect, no one and nothing is changing a religion's definition of what it will sanction as valid marriage. You can, with your religion, set all kinds of standards, rules, and rituals to comply with your "deeply held religious belief". But as soon as you push that over the whole of society, you are pushing your religious views to govern "all of us".

As C.S. Lewis would call it: "boy's logic".

The blatant hypocrisy is astounding. And that we elect people who can't reason at a higher level than a spoiled 10-year-old to office is a sad commentary on the electorate.