Christianity was able to take over the ancient world due to a myriad of factors such as:
When Christianity became the official religion of the Roman empire, it meant that most Roman subjects became Christians as well thereby boosting numbers.
Christianity also offered eternal life to people which drew more converts as they wanted to be assured of their souls being saved. The teachings of Christianity also appealed to the lower classes - which were many - as well.
Christians also purported to practice miracles which meant that they served a very powerful God.
In conclusion, Christianity took root for many reasons.
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