I learned in school that life is has do be able to do five of the following: regulate its internal environment, be composed of cell(s), transform energy, grow, adapt to the environment, respond to stimuli, and reproduce. So except for the cells and the transforming energy, a religion is "alive". As are animal colonies such as a Siphonophora and an ant colony, or a human city. Dead animal cells that are reanimated by virus DNA can also be considered alive.
I think there are varying degrees of sentience and intelligence. For example, it would be fine if all of life on Earth were wiped out by a vastly superior intellect, but it wouldn't be fine if two species of similar intelligence began waging war against each other. How similar? Well, the ratio of your intelligence to said alien that you don't want to be murdered by is the ratio of prey to predator that you should respect when choosing a diet. It would be ironic if a hivemind alien species subjugated Earth and gave rights to cities but not to humans.





