Biblical Christianity started right after the death, burial and resurrection of Jesus Christ around 30 a.d.. They were not called Christians at first, it was a term of derision, meant as an insult that was used against them by antagonistic sorts that were against them and their beliefs. It was a term used to mock them that acted like they were "little christs", which Chriistians took rather as a compliment. They were first called Christians in the First century, in the city of Antioch, which was a hotbed for early Christianity and sending out of missionaries, including Paul the Apostle.
The first century AD - some point to 17 June 31 AD on Pentecost Sunday outside of Jerusalem.
Jesus was born in the first year of this present Christian era, and this first year, is often the year referrred to when your question arises.
IN THE 18TH CENTURY
Christianity is said to have been founded in the first century CE. I grew slowly throughout the Roman Empire until, at the beginning of the 4th century, it probably consisted about ten percent of the population. At this point, Emperor Constantine gave the proto-Catholic-Orthodox branch of Christianity state patronage. This patronage made Christianity socially and politically desirable for some, and the religion grew quite rapidly. In the decade of the 380s, Christianity was made the state religion, and in 391 CE pagan worship was banned. So, Christianity became a leading religion in the fourth century CE.
Constantine made Christianity a legal religion.Constantine made Christianity a legal religion.Constantine made Christianity a legal religion.Constantine made Christianity a legal religion.Constantine made Christianity a legal religion.Constantine made Christianity a legal religion.Constantine made Christianity a legal religion.Constantine made Christianity a legal religion.Constantine made Christianity a legal religion.
Christianity began in the 1st century AD in Jerusalem.
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Were it not for Constantine granting state patronage early in the fourth century, orthodox Christianity may have always remained a minority sect in the Roman Empire. Although he granted freedom of worship to all religions, Constantine made it clear that he strongly favoured orthodox Christianity. His support made membership of the Christian Church socially and politically desirable for some, thus leading to the surge in Church membership that enabled Christianity to become the state religion later in the fourth century. Constantine also granted to the Church the right to distribute state food aid, thus allowing the Christians to proselytise to the poor. Constantine's immediate successors persecuted the pagans and encouraged the spread of Christianity. The imperial throne returned to the pagans, but the growth of Christianity had become unstoppable. In 391, Christianity was formally made the state religion.
The emperor Constantine made Christianity a legal religion.The emperor Constantine made Christianity a legal religion.The emperor Constantine made Christianity a legal religion.The emperor Constantine made Christianity a legal religion.The emperor Constantine made Christianity a legal religion.The emperor Constantine made Christianity a legal religion.The emperor Constantine made Christianity a legal religion.The emperor Constantine made Christianity a legal religion.The emperor Constantine made Christianity a legal religion.
The New Testament covers aspects from first-century Christianity.
Constantine I was the emperor who made Christianity a legal, accepted religion.Constantine I was the emperor who made Christianity a legal, accepted religion.Constantine I was the emperor who made Christianity a legal, accepted religion.Constantine I was the emperor who made Christianity a legal, accepted religion.Constantine I was the emperor who made Christianity a legal, accepted religion.Constantine I was the emperor who made Christianity a legal, accepted religion.Constantine I was the emperor who made Christianity a legal, accepted religion.Constantine I was the emperor who made Christianity a legal, accepted religion.Constantine I was the emperor who made Christianity a legal, accepted religion.
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Christianity
Pliny the Younger mentions Christianity as an established sect early in the second century. Since established sects don't appear overnight, this establishes that Christianity must have existed during the first century also.