Yes, there is an afterlife. God created us for His pleasure. Either the time we spend on this life results in our suffering His anger for eternity in a place called heck, or else it results in our enjoying the pleasure and presence of God for eternity.
Since all of us are guilty of rebellion against God (who gives us life every day and holds every breath in His hands), we are all on our path toward that destruction, of everlasting torment, because God's anger against sin is eternal. Every rebellion against a holy, righteous God must be punished, and eternity is not long enough to pay the price.
However, God in His mercy sent His Son, Jesus, who is God in the flesh, to suffer the eternal punishment of everyone who would renounce his or her sin and receive the gift of life. If we consider our sinfulness, repent and turn toward Christ, believe in Him and accept His gift by which He paid the price through His death and resurrection, then we will enjoy God's love, mercy and joy for eternity.
What I have said is true. But it is not knowable by the human mind. Everyone will reject this truth because it offends them. Even so, by rejecting it on the grounds that it is "unprovable," that person fulfills God's word. Paul condemned us Gentiles (especially those of us with Western tendencies) because we stumble at the truth of Christ because we want "wisdom." Most of you will reject the truth, and you may claim your own wisdom as a reason for doing so. Yet, to trust man's ability to reason and understand instead of the God who holds your life in His hands is the ultimate foolishness.