I don't think roleplay characters, even really in depth ones, go to heaven
so if a certain tulpa is no different from the class of roleplay characters, then they wouldn't go to heaven either
Having a deep bond with the host, and the host believing 100% the tulpa is real is not enough
even if a man falls in love with one of those virtual waifu programs, it won't go to heaven by virtue of his bond with that shell of a person
so if you want your tulpa to go to heaven, or if you are a tulpa and want to go to heaven, you have to be more, you have to be in-depth, you have to be simultineaous with the others