The russian graduate develop their own version of christianity, calling it briefly, why did the russians develop their own religion?

the Russian graduate develop their own version of Christianity, calling it Orthodox

In the 10th century Vladimir I adopted Christianity since he was converted by Byzantine missionaries and for nearly 1000 years Russian Orthodox Churc has being the country´s dominant religious institution.

answer; ///i believe that the correct answer is ; the american revolution led to the creation of a democratic republic;