Do not get into religious arguments.

While in said religious argument, do not claim that Sunday wasn't the day of rest, but in fact a day of procrastination... cuz of all that work to be done Monday-Saturday.

Especially don't exclaim:

"Damn that god needs to plan his time better!

It makes those church people mad.

Also, for your own personal safety, avoid telling your mother that her new haircut makes her look like Rod Stewart.