Nowhere in the Bible do I find any support for what is called "universalism"–the belief that everyone will be saved in the end, whether they had any faith or not.
But what would this mean? If this were true, the Hitlers of this world would never have to face judgment, and could look forward to heaven with everyone else. But that turns God into a God of injustice! It says there is no right or wrong, and we can get away with even the worst evil. But is this true? The Bible warns, "You may be sure that your sin will find you out" (Numbers 32:23).
Yes, God is the God of perfect justice. The Bible says, "Nothing in all creation is hidden from God's sight ... to whom we must give account" (Hebrews 4:13). But God also is a loving God; in fact, the Bible says, "God is love" (1 John 4:8). If He weren't, you and I would have no hope, for we have sinned and deserve only His judgment. But Christ took upon Himself the judgment we deserve–and He did it out of love.
Only God knows your uncle's heart, and what may have happened to him in the last hours of his life. But learn from him and make sure of your own commitment to Christ, for "Salvation is found in no one else" (Acts 4:12).