No. Each orthodox country has a Patriarch.
I do not know the answer to those questions. I'm sorry. I know that the end of the world is preceded by certain signs: 1.) the predication of the gospel to all nations, 2.) the conversion of the Jews to Christianity, 3.)the multiplication of sin and lawlessness, the lack of love between people, 4.) the coming of Enoch and Elijah, 5.) the coming of the Antichrist, 6.) the sign of the Cross on the sky.
... the first Church comprised Jews and Gentiles (ex-pagans), not perfect Christians brought in with an ark from another planet. Their lives and habits have been Christianized.