Isn't it just wrong for a Muslim to insult Allah or name your dog Allah? I can understand why you'd be offended by a Muslim doing that, but I can't understand why it would bother you if someone else did it. That would be like a Christian getting offended when a Muslim prays facing Mecca.
That's because we Muslims are following the orders of our God, he ordered something we do it. Allah said in the Quran >>>
"And when thou seest those who engage in vain discourse concerning OUR Signs, then turn thou away from them until they engage in a discourse other than that. And if Satan should cause thee to forget, then sit not, after recollection, with the unjust people."
"And abuse not those whom they call upon besides ALLAH, lest they, out of spite, abuse ALLAH in their ignorance."
And there are many other verses that doesn't allow us to stay with such people.
That's good an all, I don't mean to suggest you should stay with people you don't want to, just the part as to what is offensive. If I just happen to like the name Allah and name my dog that, I don't see why a Muslim would take offense. If I recall, both Muslim and Jewish faiths don't eat pork - and I could understand you thinking a Muslim doing that is wrong. But a non-Muslim? You wouldn't be offended by
me eating pork, just because it's against
your religion right? As I am a non-Muslim, it shouldn't bother you, anymore than anything else I do that runs counter to the Muslim faith.
Why should Christians be angry and feel offended, we are following the teachings of Quran 100% when we pray, worship one Almighty God. However Christians they are not following their own bible that clearly stated in many verses that Jesus was only a human approved by God and there is only one Almighty God. We Muslims we have task, since we knew the right path, we have the knowledge of the truth we should let other humans also know it otherwise we are afraid that in the day of Judgment God will ask us, Oh Muslim you knew the truth, you knew the right path, then why you didn't save your Christian friend when you saw that he was in the wrong path, what did your knowledge did to you if you didn't use it? when Christians do whatever they do we feel both sad and angry! Sad for them and angry because they are insulting their own Almighty God and ours. However we Muslims, no creator in this universe can say we are insulting Almighty God, in fact we Muslims we insult ourselves to a level where we put our head on the ground for the sake of this Almighty God, among Arabs before Islam they would have preferred dying than doing so, so Christians shouldn't feel offended 
My point is, from a (hardline) Christian perspective, you are a Sinner who will go to Hell, who offends God. It doesn't matter to them what
you think about Jesus or God, it only matters to
them what
they think of Jesus and God. But, while they generally will think you are going to Hell, they'll still respect your right to follow your own religious path, and not take personal offense to how you do it.