Rama and krishna wew not recognised as Avataras in Tretayuga and dwaparayuga. The recognition/naming was done only afterwards. Similarly somebody may recognise/publicise somebody existing now according to their taste as Kaliyuga Avataras.

Jesus Christ is the only Incarnation of God.

John 1

The Word Became Flesh

1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was with God in the beginning.
3 Through him all things were made; without him nothing was made that has been made. 4 In him was life, and that life was the light of men. 5 The light shines in the darkness, but the darkness has not understood[a] it.

6 There came a man who was sent from God; his name was John. 7 He came as a witness to testify concerning that light, so that through him all men might believe. 8 He himself was not the light; he came only as a witness to the light. 9 The true light that gives light to every man was coming into the world.[b] ...more

No idea.

You have to await for more 1000 years.

Kalki avtar is expected as per our religion

When the sins become unbearable, the avtar will surely come

We can never Know the Plan of GOD !!: ))

Well Hindus believe that bhagwan vishnu has to take avatar in kalyug, kalug avtaar name is kalki, he yet no arrived, remember he rule the earth for over 1000 years , plus on coming of him the sin destroys and satyuga start( no crime,only truth)wait and let see we are lucky enough, since he arrive when all world is filled with sin and se

When condition will be worst than Avatar will come