Who will be in the majority on the Day of Judgement?
Numbers decide nothing. The Holy Qur’an foretells from the very beginning that most people will turn away. The very fact that a few remain faithful to God against all odds is a sign of the truth.
Looking at history, the picture is clear. Those who live wholly for God have almost always been a minority. The same is true today. So the question of who will be greater in number on the Day of Judgement has in a sense already been answered. What matters more is that numbers play no part in deciding what is true.
The Holy Qur’an shows this through a conversation between God and Satan. Satan had been rejected and wanted revenge. He announced that he would prove that those who seemed to be God's servants would end up serving him. Only a few would escape him.
God replied that he should do whatever he could, with his voice, his horsemen and his foot soldiers. But one thing was certain. Over God's true servants he would have no power. About the rest God expressed no further concern in that exchange.
This conversation is a prophecy about how people would behave towards God. That the majority chooses the wrong path therefore says nothing about where the truth lies. In fact it is the reverse. When, despite everything, a few stay faithful under every pressure, that itself is a sign that they stand on the side of truth.
For each individual this means not taking direction from the crowd. Whoever recognises what is good may do it, even if he stands alone.