Why Christians today have no Happiness = rebelliousness, disobedience, taking away & adding to God's word makes a man made doctrine instead of following God's good doctrine.
* Same instructions for Israel & foreigners who follow God - Exodus 12:49
* God's good doctrine - Proverbs 4:2
* We are saved by grace & made righteous, now we are to have a righteous walk - Deut 6:25, Romans 2:13
* Our level of happiness is directly affected by how much we obey or disobey - Proverbs 29:18
Do not forsake God's good doctine - do not forsake His instructions that were meant to bless you.