How many are going to heaven?
We don't know how many there will be. There is no upper limit on how many heaven could hold. Descriptions of heaven tell us that there will be great multitude of all who followed God through the ages. "After these things I looked, and behold, a great multitude which no one could number, of all nations, tribes, peoples, and tongues, standing before the throne and before the Lamb, clothed with white robes, with palm branches in their hands" (Revelation 7:9).
But from a different viewpoint the number in heaven will be small compared to how many could have been there, if they had only obeyed God. "Enter through the narrow gate; for the gate is wide and the way is broad that leads to destruction, and there are many who enter through it. For the gate is small and the way is narrow that leads to life, and there are few who find it" (Matthew 7:13-14).