What is an institution?
What do you make of powers and principalities ensconced within institutions? (Walter Wink argues that the form of life that seems to extend beyond them that you describe is in fact a spiritual reality, though he is skeptical that they are a personal spiritual reality). Since angels are creatures, are demons also creatures? And are all spiritual beings either all-good or all-bad?
Great fun. Re: alien evangelism, have you read the Sparrow and The Book of Strange New Things?
Baptizing aliens reminded me of this classic Mere O piece: https://mereorthodoxy.com/baby-yoda-explains-christian-denominations/