You are so right! Why would anyone bother to do the right thing without even getting rewarded for it by god. It does seem crazy.
The Bible teaches that the good works we do cannot make us acceptable to God. Titus 3:5 says, “He saved us, not because of righteous things we had done, but because of his mercy. He saved us through the washing of rebirth and renewal by the Holy Spirit.” So, a Christian is someone who has been born again by God (John 3:3; John 3:7; 1 Peter 1:23) and has put faith and trust in Jesus Christ. Ephesians 2:8 tells us that it is “…by grace you have been saved, through faith—and this not from yourselves, it is the gift of God.”
A true Christian is a person who has put faith and trust in the person and work of Jesus Christ, including His death on the cross as payment for sins and His resurrection on the third day. John 1:12 tells us, “Yet to all who received him, to those who believed in his name, he gave the right to become children of God.” The mark of a true Christian is love for others and obedience to God’s Word (1 John 2:4, 10). A true Christian is indeed a child of God, a part of God’s true family, and one who has been given new life in Jesus Christ.
Are you tired of all the evil associated with the philosophy of atheism—Stalin, Hitler, Pol Pot, and so on? After all, most murderers, tyrants, and rapists are not biblical Christians, and most have rejected the God of the Bible. Even if they claim to believe in the God of the Bible, they are not really living like a true Christ follower (who strives to follow God’s Word), are they?
Do you feel conflicted about the fact that atheism has no basis in morality (i.e., no absolute right and wrong; no good, no bad?) If someone stabs you in the back, treats you like nothing, steals from you, or lies to you, it doesn’t ultimately matter in an atheistic worldview where everything and everyone are just chemical reactions doing what chemicals do. And further, knowing that you are essentially no different from a cockroach in an atheistic worldview (since people are just animals) must be disheartening.