The true reason is that once they admit that there is a God, they also must realize that they are responsible to God and in need of forgiveness from Him (Romans 3:23,6:23).
Isizathu esiyiso ukuthi uma abantu beke bakwamukela nje ukuthi uNkulunkulu ukhona, bafanele ukwazi nokuthi banokuziphendulela Kuye, futhi badinga intethelelo Yakhe (KwabaseRoma 3:23; 6:23).