Yes!
Anyone can sign up as an individual Supporter of the Campaign. You don’t have to go to a C of E church, or be an Anglican, or even a Christian. You don’t have to be gay (or straight) or trans (or cis). You don’t have to live in England or the UK. You don’t have to ‘qualify’ in any way – except, of course, that you must agree with our aims.
If you want to sign up on behalf of an organization (e.g. a church, but it could be any organization), that’s fine too, but the organization must have formally decided to support the Campaign (e.g. by a vote in a PCC meeting or equivalent) and authorized you to sign up on its behalf; if necessary we check this, to make sure that no organization is improperly signed up.