It is not always easy to see and understand why the Lord instructed certain things from time to time, yet condemned them at other times. In the case of the fiery serpent Moses was instructed to make and set it on a pole, we are not told if the serpent was 'speared' or just sitting sort of, or twisted as in the way the modern day medical symbol is made. What I am seeing in this account is that there is a vast difference between doing what the Lord commands and doing as we please. What I mean is that for me to go and make a copper figurine of a snake on a pole and attempt to use it as a cure aid for sick and dying people would be so wrong I could write a novel about it.....yet Moses did it at the Lord's command and it worked..........then Is this any different from Joshua marching around Jericho until the walls collapsed? Should we do the same to a city we don't like these days? Then, in Exo 17:6. Moses was instructed to strike a certain rock and it yielded water...that was at a place called Meribah. Then when Moses disobeyed the Lord at the second Meribah, or much more likely at Meribah the second time, Num 20:11. though the waters came, Moses did not do as the Lord commanded. Instead he did a 'Frank Sinatra' on the rock at a very great personal loss. I don't see that the bronze serpent is any kind of mandate for us to make crucifixes and hold them up high.