To be clear, the idea is that this community would be practically geared towards Muslim buyers, though legally, anyone can buy a home there. If I recall correctly, they are building the suburb around a large mosque, a private Islamic school, and a secular public community college (Though the locals will also have access to the already establised secular public schools within their distrect and will be paying taxes into them).

The issue here is that none of this is a unique or first-time practice. Many communities in Texas especially those primarily targeted toward the 'white flight' demographic are SOMETIMES built this exact same way: big, nice suburbs centered around one or two massive Protestant megachurches, private Christian schools, etc. You can easily argue that the Dallas Muslim community simply wanted their own version of this.

While communities clustered around shared identities (whether Muslim, Christian, or Jewish) can have their own insular issues, it's ultimately human nature to congregate with people who share your values and lifestyle. Regardless, the intense backlash against this project is clearly not about an opposition to de facto religiously-centric communities in general. Instead, it's exclusively because it is a Muslim-centric community, at least from the perspective of its critics.

If Protestants and Jews get to build these kinds of communities, then Muslims get to do it too.