How could you define the Trinity when you couldn't find it for 300 years...Could be your church wasn't there for the first 300 years, eh???
The Trinity was defined by the Jesus and the Apostle right from the start...
Natures aren't categorized as "flesh" and "spiritual". They are "human", "angelic", or "divine" because of their substance, not their tangible or intangible quality. Christians have one body, one nature - human.
Well I don't know about that...God is certainly divine...And He certainly is Spirit...So apparently having a divine Spirit is a 'nature'...
You are mistaken about Christians...Christians have the old nature, the corrupt flesh...They also have the new nature, the divine Holy Spirit...
Rom 7:22 For I delight in the law of God after the inward man:
The 'inward man' is the Holy Spirit in born again believers...
Rom 7:25 I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin.
Two natures; one, the corrupt flesh which serves corruption, and the inward man, the Holy Spirit who serves God...
Nice try. You said, "you guys" - who were "you guys" if not a body of believers whom you are associating with the Catholic Church? If you weren't with the Catholic Church, you were with heretics. There was no in-between "Christianity" in the Protestant sense. Thus, whomever you are aligning yourself with other than the Catholic Church pre-Nicene is/was, by default, one heresy or another.
Secondly, no one had to "find" the Trinity. The teaching of the Trinity was handed down by oral Tradition, believed by the faithful, propagated by the Fathers, and defined when Arianism and other heresies contradicted them and led massive groups away from the Catholic faith. Ironically, Protestants, for some reason, gladly subscribe to the validity of Sacred Tradition when it comes to the Trinity, totally in opposition to Sola Scriptura.
The Trinity was defined by the Jesus and the Apostle right from the start...
Where? Come now. You must have the chapter and verse that describe the inseparable, tri-person, single substance definition of the Holy Trinity, don't you?
Well I don't know about that...God is certainly divine...And He certainly is Spirit...So apparently having a divine Spirit is a 'nature'...
"Spirit" is not a nature. Satan is a spirit, does that make his nature Divine?
Satan is an angel. The Trinity is Divine. Man is human.
Two natures; one, the corrupt flesh which serves corruption, and the inward man, the Holy Spirit who serves God...
Again, "flesh" is not a nature. Flesh is just material. Your substance - your nature - your lifeforce - is the human soul made in the image of God, not divided between "flesh" and "spirit". Jesus had the lifeforces of both an incarnate soul and the eternal existence of His own divinity.
You can't separate your soul from your humanity. The Holy Spirit does not change you from human to something else. i.e., you and I will never be divine or angelic. Mormons, IIRC, believe that one can achieve a divine nature.
The 'inward man' is the Holy Spirit in born again believers...
Yes, it's the Holy Spirit - not the person in which He resides. Your nature does not change. We become new men, not angelic or divine.