They are symbols. I care little for them.
THe notion of separating church and state was a noble one, crucial in releasing law making and government from the narrow confines of religious doctrine. We couldn't do it so we separated state and government instead. Same difference, does the job.
In the same way it irritates me slightly when people go and see a metro system built 50 years ago and say it is so much more effective and rational than the tube. Of course it is, it was purpose built. Ours is centuries old and had had to evolve to cope with different eras.