Certainly an individual can be happy without false religion, but a person cannot be truly happy unless he has a relationship with Jehovah, who is described as “the happy God. ”
لَا شَكَّ أَنَّ ٱلْإِنْسَانَ يَعِيشُ سَعِيدًا بِلَا ٱلدِّينِ ٱلْبَاطِلِ .‏