What Christians

Why do Christians use their faith to excuse impolite abnormal irrational behaviour?  It's not Christian? Oh really, I thought it was you being ignorant.  I didn't realise that you are taught to be like that in the Bible.  Is that true?  Of course not, people make rules for themselves to suit themself.  God didn't, Jesus didn't and we shouldn't churches are full of self-righteous people sitting in judgement of others, people nodding in agreement with the pastor but not identifying anything spoken about to their own position.  They see faults only in others.  God help us all.