Shouldn't It Come Naturally?

In recent conversations with my Sweetie I have found my self saying, "We need to do the Christian thing in this matter." and "We need to approach this from a Christian viewpoint."
It would seem that we were struggling to deal with some difficult situations and wanted to be sure that we were acting as Christians. It has now made me think -- should we have to work at doing things in a Christian manner or shouldn't it just come naturally? What do you think?

Do you always act in a Christian way, or do you have to stop and think about what you are thinking of doing and how it will be perceived by the others involved?
...........I'm reminded of WWJD -- the catch phrase that people wore/wear on wrists, caps, pins, etc. It has appeared on notebooks, stationery, and address labels. "WWJD -- What would Jesus Do." Should we have to stop and think or should it be automatic? Hummmm, well, I don't know about you, but I have to stop and think.
..........I talked to a young family member this morning -- she is having problems with her immediate family members. The quarrel between her and her parents has escalated throughout the summer and it would seem that she is busy trying to involve other family members in the matter, though she says she is not. This is something that I definitely don't want to get involved in, yet.... as she said, whenever any of us talk together, the subject always comes up. It is rather like the elephant in the room -- it is always there and it colors every conversation. I found myself trying to weigh my words to her as to whether or not they were true, kind, and Christian.
I guess I haven't reached that level, yet, where I can speak freely without worrying about what comes flowing out of my mouth.
Shouldn't it come naturally? Or, is this something we all have to struggle with on a day to day basis. Does it have to do with being human? Does the evil one try to trip us up?
Your opinion will be appreciated.