the Council of Chalcedon that was held from October 8 through November 1 in The Year of our LORD 451 was NOT to prove the Jesus was a real person but to prove that he has risen from the dead and was GOD.

Followers of the Council believe its most important achievement was to issue the Chalcedonian Definition, stating that Jesus is "perfect both in deity and in humanness; this selfsame one is also actually God and actually man."[2] The council's judgments and definitions regarding the divine marked a significant turning point in the Christological debates.

https://en.m.wikipedia.org/wiki/Council_of_Chalcedon

“No one in hell can ever say I went to Christ and He rejected me.

C.H. Spurgeon