Matthew 7:13: Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat:
Matthew 7:14: Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.
Matthew 7:15: Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
And besides, many people will be in purgatory, so heaven will not be crammed ...
Next time you read the Bible, thank a Catholic for preserving the scripture for you. Because, it was the Catholic Monks who saved the scriptures.