The Convert's Catechism of Catholic Doctrine by Peter Geiermann
This book contains the beliefs that a new convert to the Catholic religion needs to know. It also documents how the forefathers of this religious system tried to change God's holy day from the 7th day to the 1st day of the week. Once seekers of the truth read this book, they cannot become members of a 1st- day-keeping church! Very informative.