To Tithe or Not to Tithe???

How long is it acceptable to be wrong under the assumption of right without proper investigation? For thousands of years mankind believed the world was flat. For over 1,000 years most Christians were Catholics who also worshipped Mary equally with Christ, and believed the Pope was God's chief and final authority on the earth in the place of Christ. For hundreds of years in the United States it was taught, believed, and accepted that black people were inferior to white people. I've heard it taught that non-tithers are cursed, should not be allowed to participate in church activities, should be kicked out of church, should be shot, and are robbing God among other things.