I think the poster's point is that people are reducing themselves to 0 or 1. That's essentially the problem with identity politics, people are complicated with many facets; why would you latch on to 1 identifying trait?
And that is where the issue is. Just because you have a specific belief/views, doesn't make you more/less stupid or more/less intelectual. Having a specific religion doesn't suddently turn off your brain and tells you not to become a good developer, a good person or good scientist.
You're completely correct but I'm not sure that negates the point.
What a person's specific religion is isn't interesting, just like their hobbies aren't interesting. They just don't say a lot about the person.
What _might_ be interesting, is if you only have one interest in life. e.g. Bubba Blue (from Forrest Gump) isn't someone I'd want to spend a lot of time with, even though I like shrimp.
You are reducing people to binary 0 and 1's. Humans are far advanced and complex creatures than you believe them to be.