I'm not sure why you're getting defensive, if you don't think that way then you don't have to defend yourself about this.
But now that you've brought it up, I think you should consider that your view still sends most of the world's population to hell (assuming you also believe in hell, some don't). By adding other christians to the list, you've just increased the percentage that is saved from a small minority to a larger minority. That's not exactly a happy model from where I stand.
See, this is what I'm getting it. The trinity is not shared by all Christians, it is a doctrine that came around in the few hundred years after Jesus died and faced hundreds years more of resistance. Lots of current sects don't accept it. It doesn't make sense for an outsider to say that you have to believe in the trinity to be a "real christian".
I can't give a straight answer about how they have to see Jesus (it would require a very long and not useful discussion), but he definitely has to be central to their view. If he's just a footnote then I wouldn't call them a christian. Also, they're straight up lying about it then of course they don't count. Same if they try to bastardize the definition to some ridiculous level like "a christian is someone who thinks the sky is blue. I think the sky is blue, therefore I'm a christian". These extreme cases aren't really what we're talking about though.
I think this is reasonable, but Christian-adjacent still holds a lot of practical relevance to understanding Christianity and the world.