Friend, here is a good summary of the term Hypostatic Union, where it came from, and an article by a non-Catholic Christian about the subject. May be more palatable knowing that other Christians do indeed embrace and ascribe to this important truth about Christ.

The term "hypostatic union" originated from the Council of Chalcedon in 451 AD. The term is used to describe the belief that Jesus Christ was both fully human and fully divine at the same time. The term comes from the Greek word hypostasis, which means "subsistence" or "individual existence".

The term was used in the context of the Incarnation, to describe the idea that Christ had two natures, but was one person. The Council of Chalcedon's definition of the hypostatic union included four negative statements, including that Jesus Christ was not a third thing, and that the incarnation did not change the divine Son in any substantial way.

The term hypostasis was used by Greek philosophers to distinguish reality from appearances, and it also appears in the Epistles of St. Paul. However, in early church discussions, the word began to be used to refer to the distinctness of the three persons in the Trinity, rather than the sameness of God's essence.

https://www.desiringgod.org/articles/what-is-the-hypostatic-union