Eh, if the things labeled christian diverges wildly from what you believe, what you believe probably isn't christian, though you likely shanghai'd the name.
I suppose that depends on how you interpreted 'diverges wildly'. I didn't think it was that vague... I mean, most denominations that claim to be Christian have essentially the same core faiths like the Trinity and Jesus is divine (although you can't assume this - some Christian seminaries don't actually teach this). But beyond that, things can be pretty different in terms of what even that 'core' faith means in terms of how your life might be affected. I mean, people tend to have this view that "Evangelical Christian" in the US means Dispensationalism and hypocrisy, heavy personal salvation but don't have to change behavior, your neighbor be damned, etc. Some denominations are heavily works based, some are all about only "personal" salvation, your neighbor be damed to fire and brimstone, others are about loving your neighbors and enemies (though not necessarily supporting their behaviors), etc. etc. And that's not even getting into stuff like church governance (hierarchical? congregational?), is wearing (or not) a hat a sin, and are guitars the work of the devil (forgetting that David worshipped so freely he got criticized for not dressing properly while doing so)?
I mean, there are "reasonable" differences in theology like is communion transubstantiation or not, just what does predestination mean anyway, that are kind of "non-divisive" but then you go down the rabbit hole into things like qualification for church leaders and sexuality and roles of men, women, children, and hats. And some of these aren't trivial either - they speak volumes about people's views of God and humanity and the relationship between them - especially with the more recent developments about morality (which oddly focuses on consensual sexuality, you don't hear much controversy about substance abuse or financial corruption - is it ok to have a practicing embezzler be a head pastor?) that sort of confound the concept of an unchanging God (which, depending on your denomination, may or may not be a thing).
So all that to say - both in religion and politics - there is almost assuredly not any organized group with more than one person that has exactly the same beliefs.