Study the Word of God beginning with the Gospel of John.
Religion involves man trying to reach God or a better afterlife by doing good works. In contrast, Biblical Christianity is Christ reaching down and giving sinful man eternal life as a FREE GIFT. It is GRACE that separates the truth from false religion.
Death leads to heaven or hell, and the only way to be saved from hell is to believe in Jesus Christ for His free gift of eternal life. Jesus died on the cross to pay for all your sins and rose again (1 Cor. 15:3-4). The moment you place your faith in Him alone, ALL of your sins (past, present, and future) are totally forgiven and you are guaranteed everlasting life. Simply believe in Him alone to save you and you will go to heaven no matter what!
"Most assuredly, I say to you, he who believes in Me has everlasting life" (John 6:47).