I really didn't know Christians are supposed to obey the 10 commandments. There are at least two commandments Christians don't seem to observe: The Sabbath, and the prohibition of making statues and images.
I think the ten commandments are given to the Jews at Mount Sinai. They are not given to the gentiles. Althrough we can see the will of god through the ten commandments because it is the same god for Christians and Jews.
But I think we have to differ between those commandments who apply only to the Jews and those who apply to all.
There is nothing wrong with having one day to rest for Christians. But the Jewish Sabbat is more than simply resting. Of cause the special Jewish rules of Sabbat doesn't apply to the Christians. On the other hand the Christian Sunday is more a day of assembly and worship than resting.
In the case of statues and images it applies to all. So imo it is not suitable to have statues and crosses in places of Christian worship.
Some Christians say, that they are only symbols, but this is imo a bad excuse. Reformed Christian churches have no cross or no images and statues. In fact they are unneccessary, because there is no text in the NT that advocates it.