I really don't know why I'm agnostic
An agnostic is a person who feels that God's existence can neither be proved nor disproved, on the basis of current evidence. Their lack of decisiveness is generally the result of doubt.
Bible tells that anyone who who rejecct Christ will be lost. Becasue we are born into sin, it import for a agnostic to resolve the problem they have with God's existance.
If you visit the ruines of any number of accent civilizations, you will find the concept of a Supreme Being has long been very popular. Even in our age of techical advancement most people our convinced that there is a God that watches over them. Given the aburdance evidence in nature, faith is reasonable. That is why the psalmist declared: “The fool hath said in his heart, There is no God” (Psalm 14:1).