"May" sounds dodgy like you're not sure of what you're saying and only guessing. Go with "Is" makes you sound confident, important in a speech...
Otherwise *Neowie*
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And in case you don't trust my...
Omg both definitions I just said were said by 2 of the nerdiest english nerds in baulko, just accept that and use that -.-. If in cloudy with a chance of neowies, then just change what the person is trying to belong into.
So instead of
"Belonging is the inherent nature of humans to connect...
be·long·ing (b-lôngng, -lng-)n.1. A personal item that one owns; a possession. Often used in the plural.
2. Acceptance as a natural member or part: a sense of belonging.
Or you can just say something like "Belonging is the inherent nature of humans to connect with others."
It's basically...