Depends upon your definition of unity.
the state of being united or joined as a whole.
synonyms: union, unification, integration, amalgamation;
coalition, federation, confederation
Your own ego may be causing you to see things as animosity.
Which was the point I was making. To see differences does not automatically translate into animosity. That "us vs. them" mentality is an expression of ego. It is not however an expression of Love, which unites diversity as a whole, respecting the different parts. The Bible teaches a great deal about this, in 1 Cor in particular talking about all being members of the same body, while being a hand, or a foot, or an eye, etc. The ego has the hand saying to the foot, you are not part of the body because you are not a hand and look and function as I do. Example, "You're not a true Christian if you don't believe the Bible literally." That's an example of ego.
I’m no expert, but my elementary Google searches this morning tell me that Buddhism, Hinduism, atheism, “no ism” all involve dualism in one way or the other, because they all cause a person to have to make a choice.
Making a choice has nothing to do with dualism as I am talking about it. Dualism is a separation between this and that, between subject and object, between self and others, and so forth. But dualism which functions through Love as the Uniting Principle, holds diversity, hold this separateness, together harmoniously. It doesn't just do away with diversity in order to remove divisions (something many Christians try to do in forcing their beliefs on others). It rather celebrates diversity, honoring each as beautiful and true in their own uniquenesses.
Do I want to based upon what is taught, or do I not want to?
What is taught, and what is understood is a matter of perspective. What I hear in Jesus' words, for instance, may in fact not be what you are hearing. Same words, different contexts in which they are heard and understood.
But...what’s in a word, right? Wouldn’t want to go to Hell or whatever other negative dimension based upon a word.
Is salvation this tenuous for you that you have to believe correctly? To me, this completely misses Love.