Friend, there was nothing 'ad hominem' about what I wrote. For example, if a person likes wine then he is an oenophile by definition. If he does not like wine, then is not an oenophile by definition. The definition of who is and who is not a Christian is not *mine*, but comes to us first from Scripture, and second from the church -- i.e., in the ecumenical creeds and confessions. If you've never read the Nicene Creed, or the Athanasian creed, or the definition of Chalcedon, for example, then please do check them out--all are free online--comparing Scripture with Scripture always (Acts 17:11).
Drawing from one of those confessions, namely, the Westminster Standards (WLC), we believe the following:
Q. 6. What do the Scriptures make known of God?
A. The Scriptures make known what God is, the persons in the Godhead, his decrees, and the execution of his decrees.
Q. 7. What is God?
A. God is a Spirit, in and of himself infinite in being, glory, blessedness, and perfection; all-sufficient, eternal, unchangeable, incomprehensible, everywhere present, almighty, knowing all things, most wise, most holy, most just, most merciful and gracious, longsuffering, and abundant in goodness and truth.
Q. 8. Are there more Gods than one?
A. There is but one only, the living and true God.
Q. 9. How many persons are there in the Godhead?
A. There be three persons in the Godhead, the Father, the Son, and the Holy Ghost; and these three are one true, eternal God, the same in substance, equal in power and glory; although distinguished by their personal properties.
Q. 10. What are the personal properties of the three persons in the Godhead?
A. It is proper to the Father to beget the Son, and to the Son to be begotten of the Father, and to the Holy Ghost to proceed from the Father and the Son from all eternity.
Q. 11. How doth it appear that the Son and the Holy Ghost are God equal with the Father?
A. The Scriptures manifest that the Son and the Holy Ghost are God equal with the Father, ascribing unto them such names, attributes, works, and worship, as are proper to God only.
This last one, Q11, is of particular interest: "ascribing unto them such names, attributes, works, and worship, as are proper to God only." If you'd like a version with proof texts, see the 2nd link below.
[Westminster Larger Catechism](https://opc.org/lc.html)
[Westminster Larger Catechism (with proofs)](https://opc.org/documents/LCLayout.pdf)