Yes, exactly. I haven’t really had any issues with any website taking the email, some people do actually have subdomains in an email for work, I know some of my teachers in school had an email like person@k12.county.state.gov.
It also has the advantage of letting you have multiple users on your server, a couple of my family members also have their own subdomain catch-all that redirects to their own base domain address.
Some religions believe that they should proselytize as many people as possible, so really not letting them convert you is disrespectful to their beliefs.
I agree that there’s a difference, but I’m not sure a simple argument like this really works since it is difficult to say one belief is ‘better.’