It has to do with always using the word "believe." Why I believe Christ is the Son of God. Why I believe the rapture will be after the tribulation. Why I believe that Christian School is the only option for Christian Parents. In my mind, that is when to use "believe." Belief has to do with faith, with those things that the bible teaches and we hold to be true based on what we read.
Why I think a woman should not be president. Why I think that Seven Eleven is better than Buc-ees. In those cases, it is what I think.
So then when someone "believes" a different way, it has to do with interpretation of scriptures. And if their belief is based on faulty interpretation, they are not orthdox. In Fundamental Baptist churches and colleges and seminaries, I was taught that Lutherans, Methodists, Presbyterians, Bible Church, Church of Christ, Southern Baptists, Calvary Chapel, Pentecostals, etc., all believed differently, hence a different gospel. That is a pretty common way of thinking in Fundamental Baptist churches. If you believe differently, you are Not orthodox, or as the old line fundies say, you are a pink lemonade sippnig, virgin birth denying, booze swizzling, movie going, pants wearing liberal.
It feels like you are saying that if I "believe" that trump was elected for different reasons that you do, I am in that non-orthodox category, and we need to separate ecclesiastically. But if I just think differently, we can fellowship.