If Gabriel lives in Muslim Heaven..(he's the dude that allegedly inspired the Quran) and that same angel Gabriel is in Christian heaven...?

Muslim heaven as in Mo's Imaginarium? Christian Heaven as in Saint Paul's Disneyland?

Interesting fact, did you know both of them showed some symptoms that suggest they probably had temporal lobe epilepsy which often leads people to have weird mystical experiences and pedantism.

It was impressive enough for illiterate people to believe that condition was from God, rather than faulty wiring in the hardware.

Depending on whose imagination you share, you will have a concept of Gabriel with a dissociative identity disorder.

Rev 19:20 And the beast was taken, and with him the false prophet that wrought miracles before him, with which he deceived them that had received the mark of the beast, and them that worshipped his image. These both were cast alive into a lake of fire burning with brimstone.

Quran came hundreds of years later. Where you think they got their information from?

I think they go to different heavens. One is where women are sill walking vaginas and one where everyone is sexually frustrated.