Does not the Church oppose Cremation because she knows that it renders any idea of a resurrection impossible?

The Catholic Answers

No. Cremation does not affect the question of the resurrection. Cremation means but a more rapid separation of the elements of the body, and even if the ashes be scattered to the winds, God can quite easily reassemble those elements. What is impossible to us is not impossible to God. Remember that there is no such thing as the absolute destruction of matter. There can be merely a transformation of matter. However many changes matter may go through, it is always there, still in existence. And the God, who created matter, can easily transform it back again into the bodies which it formed previously. No matter how men treat human bodies, or where they put them, some day they will all rise again.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty