Saying "I don't believe in marriage because I don't believe in marriage," women searching fuck or any version of that sentiment is quite insulting and, in my opinion, just a cover to hide your indifference to the issue. No one who says they're against marriage actually makes any effort to try and get rid of marriage, they just throw up their sign, empty words with no actions, meant only to allow them to avoid the issue altogether. Marriage is an important legal contract that opens up benefits to the people that enter them. The whole issue about marriage is not about whether the institution of marriage is valid, it's about people having equal access to it. So you can either create an organization and push for the removal of marriage in society, or you can continue to say nothing. But if you're going to continue to say nothing, then do yourself a favour and don't waste the breath it takes to say "I don't believe in marriage."