It is understandable as they were raised in it and and had 1500 years of heritage in it.   

All the rituals that crept into the church came from judaic thinking.   

So, everything that is not of Grace and Faith is UNCHRISTIAN.   Period.   

Jesus came that we could be cleansed and filled with His Words and His Holy Spirit so that we can fellowship with Him and do His works in the earth.