You really need to narrow your question down a bit. A lot of Jews embraced Christianity, and, over the next several centuries, a lot of pagans embraced Christianity.
Christianity and Islam
Paul the Apostle.
Constantine
The ideas of Christianity were seen by many as a threat to the Roman Empire. Some believe that is why Rome eventually embraced Christianity, as to influence it.
The two main groups are Catholic and Protestant. These split into many subcategories, but these are the main two.
Monks and missionaries
prostants and catholics! youre welcome;)
There are a total of two syllables in the word "embraced".
Christianity and Non Religious/Secular A+LS: catholic & baptist
Many of them embraced Islam and became very good Muslims.
Prince Vladimir embraced Orthodox Christianity as the religion for the Russian people in 988 AD.
King Ezana of Axum converted to Christianity.