One idea from this article:
Baptism is necessary to get to Heaven,
so missionary activity aims to help as many people as possible receive Baptism in the Church....the ideal preferred by Jesus

But there's more than one way for a person to be baptized

Unless we think most of the human race goes to Hell, we must realise that most people in Heaven are there not through baptism with water by the Church, but by "baptism of desire" through living a life of good deeds.....as Jesus himself put it in the words: "Welcome to Heaven my friend, because whenever you helped a poor person, you helped me"

Jesus, may as many people as possible receive Baptism in the Church

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