The 2nd century began approximately 100 years (+/- 10 years) after Jesus Christ was born. Time divides from BC (or BCE) to AD (or CE) with the estimated birth year of Jesus.
before christ is 2000 years prior
BC means Before Christ. So, in this case, eighth century BC means: eight centuries Before Christ. Christ, as in Jesus Christ was born in the year 0. So, everything before the year 0, is called Before Christ, or B.C.
3rd century BC (before christ)
Yes it was 17 centuries before the 17th century.
No, Christianity did not exist before the time of Christ. It was founded by Jesus Christ in the 1st century AD.
3rd century before christ
Study island.
No, it is in the second century BC. As a general rule, if you do not specify BC or AD, the assumption is that you are talking about AD. Some use BCE and CE to reference 'Before Common Era' and 'Common Era' instead of the references to Christ.
Zechariah.6th century before Christ.
India, about 6th century before the birth of Christ
It was written in 11 century before Christ (BC)
in the 5th century B.C. (Before Christ)