OK Kanabite ... I won't tear you apart ...
... but I do need to make a rebuttal ...
First, very few if any of those aware of these Mystery Glyph panels think them to be of religious origin its pretty evenly divided between two camps, those who think they are modern and those who think they are old a smaller percentage either dont have an opinion or think they may be treasure related (Spanish, KGC, etc)
Second the use of certain symbols cannot necessarily be used to determine the age of the symbols and heres why just bear with me if these were made by a group of individuals, then they most likely would have been a small group and maybe nomadic, either way they no longer exist in a state we recognize today Im willing to bet that who ever left these are now extinct if that is the case we have no idea what level of intelligence or exposure to other groups they may have had they could have used any number of methods, but because we can not study their history we just dont have any way of knowing what they were capable of maybe they migrated here from somewhere else and the ying yang and swastika and other symbols were all apart of their language from where they came from impossible you say? Well it so happens that we have found three different languages in written form which sport some of the Mystery Glyph symbols, and are always on the look out for others one of those languages has a lot of the same symbols and is written in stone in the same manner, and no one knows what they say either or who left them this is in another part of the world as well mind you Ive also found some references to a couple of possibilities from South America but have not been able to confirm them yet
Third some of the panels have what appear to be hand prints on the symbols that are outside the main panel of symbols this doesnt mean a whole lot necessarily, but they are there and appear to be old Ive never known the Spanish or any other known group to leave their palm prints on top of marks they have left its always the left hand that is used and from the hand prints that we can see, it would appear to be at lease several different individuals who left their mark this feature is fairly unique to the Mystery Glyphs
Fourth So far all of the known panels are fairly well spread out across the Western US if they were forged or modern, I think you would have only a handful of panels at best and they would be much more centrally located in relation to one another Im fairly confident that there are yet undiscovered panels of the Mystery Glyphs, again we are always on the look out for new panels for obvious reasons and are currently tracking down some leads which will hopefully provide us with new panels to research and maybe even help us understand them better than we do now
So in a nutshell personally I dont think they are modern, nor were they made by any well known group such as the Spanish or the KGC who left them? <shrugs shoulders> only time will tell, hopefully one thing is for certain, who ever it was felt it was important to leave their mark for whatever reason