What has the Catholic belief system altered?
You don't yet get that the use of the word alter instead of altar shows how different belief systems have "altered" God's plan with altars to false Gods and Mary?
Nitpicking over mispillings and thypos and asking inane questions is a lot easier than explaining away the many unBiblical rules/beliefs/practices isn't it?
Mary has become the center of the Catholic religion, as shown by this
Catholic "Alter"
Notice who is the central figure in the picture (not to mention higher than Jesus as are angels [should I have capitalized "Angels?"]) of a place where Catholics kneel down and give "adoration."