Many people have a problem accepting God in the flesh but they also fail to realize that this already happened before...

Matt. 10:25Jesus answered, "I did tell you, but you do not believe. The miracles I do in my Father's name speak for me, 26but you do not believe because you are not my sheep. 27My sheep listen to my voice; I know them, and they follow me. 28I give them eternal life, and they shall never perish; no one can snatch them out of my hand. 29My Father, who has given them to me, is greater than all[d]; no one can snatch them out of my Father's hand. 30I and the Father are one."
31Again the Jews picked up stones to stone him, 32but Jesus said to them, "I have shown you many great miracles from the Father. For which of these do you stone me?"
33"We are not stoning you for any of these," replied the Jews, "but for blasphemy, because you, a mere man, claim to be God."


1 John 4:3but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world.


1 John 1:7 Many deceivers, who do not acknowledge Jesus Christ as coming in the flesh, have gone out into the world. Any such person is the deceiver and the antichrist.

Since the beginning people have rejected the name of the savior of the age so why should the Holy Spirit age be any different....