Can you stop with that meme?
That's an old source that misses one crucial detail. One twin is going to be the incarnation of Raava and the other Vaatu. So... more like avatar and anti-avatar.
Personally I would have given the anti-avatar different powers from the avatar if I was in charge of the show, just so it doesn't feel like a "face yourself" level of Super Smash Bros.
First avatar was Aang, an airbender. Second avatar was Korra, a waterbender. The third and new avatar is going to be Pavi, an earthbender. She is doing the same thing as Korra, with the main difference being Vaatu has his own lineage of avatars now and is the villain (think the Good Twin Bad Twin trope in mythology) and where the avatar gives people very Spiderman-esque vibes (people wondering what her use is in the modern world).
My dad calls himself a BuJew Cath, which is Buddhist, Jewish and Catholic. “How does Jewish and Catholic work together?” you might ask. The answer is, it doesn’t. My dad is insane. He does it to prevent people from accusing him of being close-minded and so he can claim he’s a minority.
In such an instance, I go by a rule. If someone is going to say they want their religion to be respected in some instances, they should follow it in all instances. For example, don't ask a taxi client to take their dog out of the taxi due to you being a Muslim only for you to go home and eat pork which is anti-Islamic.
You being everyone that isn't someone else is a 50/50 given at this point. Next people will be calling you the demigoddess/prophet of the one true god.