Which country adopted christianity first?

Answer 1

That is what Wikipedia says:

In Armenia, the Armenian Church was founded by two of Jesus' twelve apostles -Thaddaeus and Bartholomew- who preached Christianity in Armenia between 40-60 CE. Because of these two founding apostles, the official name of the Armenian Church is Armenian Apostolic Church. Armenia was the first nation to adopt Christianity as a state religion, in 301. In Georgia, Christianity was first preached by the Apostles Simon and Andrew in the first century, and became the state religion of Kartli (Iberia) in 327, making Georgia the second oldest Christian country after Armenia. The final conversion of Georgia to Christianity in 327 is credited to St. Nino of Cappadocia.

Answer 2

first was Armenia, second Georgia. It is official!