There is only one God and God is one.
Three is not one; one is not three.
And there is only one mediator between God and man, the MAN Christ Jesus.
God is not a man that he should lie or the son of man that he should repent.
God is spirit and invisible.
Jesus came in (totally in) the flesh and he that denies that is antichrist.
The heresy of Monophysitism was rejected by the Council of Chalcedon in the year 451AD.
THE COUNCIL OF CHALCEDON (451 AD)
Definition concerning the two natures of Christ. Following, then, the holy fathers, we unite in teaching all men to confess the one and only Son, our Lord Jesus Christ. This selfsame one is perfect both in deity and in humanness; this selfsame one is also actually God and actually man, with a rational soul [meaning human soul] and a body. He is of the same reality as God as far as his deity is concerned and of the same reality as we ourselves as far as his humanness is concerned; thus like us in all respects, sin only excepted. Before time began he was begotten of the Father, in respect of his deity, and now in these "last days," for us and behalf of our salvation, this selfsame one was born of Mary the virgin, who is God-bearer in respect of his humanness.
We also teach that we apprehend this one and only Christ-Son, Lord, only-begotten — in two natures; and we do this without confusing the two natures, without transmuting one nature into the other, without dividing them into two separate categories, without contrasting them according to area or function. The distinctiveness of each nature is not nullified by the union. Instead, the "properties" of each nature are conserved and both natures concur in one "person" and in one reality [hypostasis]. They are not divided or cut into two persons, but are together the one and only and only-begotten Word [Logos], God, the Lord Jesus Christ. Thus have the prophets of old testified; thus the Lord Jesus Christ himself taught us; thus the Symbol of Fathers [the Nicene Creed] has handed down to us.
Therefore, now that we have set forth all these things with a care and diligence exact in every respect, the holy and universal Synod defines once and for all that no one may profess, write up or compose, think, or teach to others, any other faith.