The fact that the Church comprises both men and women and that this (according to John Richardson) is the ultimate paradigm for marriage, suggests that marriage is indeed 'genderless' - it has just taken the church a long time to realise it (like the abolition of slavery and the movement of the sun).No-one, of course would suggest that there is a literal 'sexual' component to the marriage of Christ and his Church, but that further calls into question relying on this paradigm for our full understanding of marriage. Indeed Paul says in Ephesians 5 that "this is a profound mystery". It is a mystery which we are still unravelling, and perhaps we haven't quite got there yet.
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