Anyway, the goal was to have understanding and not to idolize your opinions based on your emotional perceptions. You shouldn't spit in the chalice of wine for communion to be so close to your parishioners in your denomination.   It was something your grandfather might have taught you but you can put those old wives' tales behind you.  Jesus was right about everything( He knew what was in man) but He decided to show grace. It is by grace you were saved. Read Ephesians 2:8.    Read Matthew 7 and Mark 4 and Mark 7 and worry about your own dirty clothing or your new washed shirt falling to the ground. If it makes your grandmother feel better about you, throw it out or wash it again before you put it on.  Ultimately, your grandmother spent most of her time dissipating her energy after she left her job in anger at her boss' genuine cleanliness by smoking weed and drinking.  She should have just given him the same patience that she sought from others who did not like her choice of diluted soaps from the dollar store to wash the floors where her pet weasel would pee.  So, read Mark 7.  There were no denominations at the time of the founding of the church in the book of Acts. The Lord did make it clear that they would need  His help. It is on that day that help came. There were no baptists, Calvinists or Lutherans that day but just followers of the way of Christ; also known as messianic Jews.