What is the belief that god has known since the beginning of time who will be saved?

Calvinism is the belief which teaches that at the beginning of time God decided who would be saved. Romans 8:29-30 says that in God's foreknowledge, He predestinated those He knew would be saved to be conformed to Christ, but God did not choose people to be saved and others to not be saved. He knew ahead of time who would accept Him and who would reject Him. Several passages in The Bible say that God is willing for all people to come to Him for salvation.