In the days of old, believers and unbelievers gave out of appreciation to God but giving to God now is like a business transaction. What gives?
Tithe is a requirement.
Offering is in appreciation to God for what he has done. People usually consider this as thanksgiving.
Galatians 6:7 King James Version (KJV)7 Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap. What do you get when you sow grudgingly?
2 Corinthians 9:7 (NIV) 7 Each of you should give what you have decided in your heart to give, not reluctantly or under compulsion, for God loves a cheerful giver.