@kravietz Ther eis a big difference between the actual definitions of left and right and the way people use those words. This is simply because most people are uneducated and arent very careful when it comes to their choice of words.
Being christian has no bearing what so ever on being left or right. Left and right are a question of what your stance is economically, do you favor taking money fromt he rich to help the poor (left) or do you favor free market which may or may not provide a solution to that (the right)
I think what you really mean here is Liberal vs Conservative in the general sense. Those ideas are more closely related to christianity and has a tie in to free-market philosophy as well. But that has more to do with party affiliation than a spectrum for a specific philosophical quality.