When Jesus prays that we be one as He and the Father are one – that is not organizational unity. It is spiritual unity. They are of one heart and one mind.
It could be that our Lord is praying for us to recognize the unity that we already have – of being one in Jesus Christ.
We have all been created by God; we all share in the one baptism – we partake of the one bread and the one cup. We have all been redeemed by the one and same Jesus Christ.
Let us rejoice in all that makes us one and help answer the prayer of Jesus.