There's no such thing as a "denomination free" anything when it comes to Christianity.
Every Christian is a Christian within a particular theological tradition. And that means each of us approaches Scripture, reads Scripture, and also applies Scripture through the biases of our tradition.
To avoid outright heresy we ought to adhere closely to the historic and foundational tenets of our faith. That means embracing, rather than shying away from, foundational Christian language, like talking about the Trinity.
That's why we should learn, understand, be taught, and confess the historic confession and creeds of the Church. Especially the Nicene Creed.
Say, with boldness, that you believe in one God, Holy Trinity; that you worship the one God in Trinity and Trinity in Unity, neither confusing the Persons nor dividing the Essence. If, for some reason, you don't understand what that means, then learn. Learn what it means when we say "Trinity", learn what it means to speak of the Three Persons with neither confusion nor separation.
Understanding good theology can only be beneficial, because it establishes a solid foundation of being able to talk about your faith with others, especially those outside of the faith. So when a non-believer or a heretic is confused about, e.g., our faith in the Holy Trinity we can "give answer" as St. Peter says.
-CryptoLutheran