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yes it is:
in folder .../common/ you find the file religion.txt. in this file all religions have a specific color-code. try it out, what numbers in the line
druidism = {
color = { 0.6 0.7 0.6 }
}
gives you a nice blue. ;)

if it´s like a rgb-code you should try 0.0 0.0 1.0