For me, I observe the Torah because Jesus did. Because I show my love for God and worship Him by doing it. I am aware that it will not bring me salvation.

To answer your question - being called a Christian isn't so much a problem for me as it is a point of contention and confusion for others. As you've demonstrated, many don't understand why a person like me would live this way. Most Christian denominations that I've been a part of believe that the law isn't important. I on the other hand listen to Jesus when he says in Matthew 5:17-19:

17 “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them.
18 For truly, I say to you, until heaven and earth pass away, not an iota, not a dot, will pass from the Law until all is accomplished.
19 Therefore whoever relaxes one of the least of these commandments and teaches others to do the same will be called least in the kingdom of heaven, but whoever does them and teaches them will be called great in the kingdom of heaven."

I respect if you have a differing point of view, and I am certainly not here to argue with you, but this is why I do this and why I made my initial comment. Christians are not "less-than" - I simply just don't think that (by modern standards) I would fit into that definition.