There is a God. Heaven is real. Hell is real. The only way to go to Heaven is by believing in God, the Lord Jesus Christ. The Earth is temporal, but your soul is immaterial, and eternal.
If you die without ever having believed on Jesus Christ, you will be left alone for all eternity. It’s your choice. The Bible calls Hell a “bottomless pit,” because Hell is a God-sized void. It is an infinite vacuum that exists, by definition, once an infinite God leaves you for all eternity.
Salvation is easy. God, Himself, is salvation. Anyone who believes on Jesus Christ is saved once and for all. There is nothing that you could ever do, to merit salvation. It is 100% by grace, through faith in Jesus Christ. You do not have to do any “good deeds.” Only believe in Jesus Christ, that he paid for all your sins: past, present, and future, forever.
Romans 4:5
But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness.
John 5:24
Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life.