As a result of Christian missionary's efforts to wipe out "pagan" holidays, such as Samhain, they succeeded in effecting major transformations in it. In 601 A.D. Pope Gregory I issued a now famous edict to his missionaries concerning the native beliefs and customs of the peoples he hoped to convert. Rather than try to obliterate native peoples' customs and beliefs, the pope instructed his missionaries to use them: if a group of people worshiped a tree, rather than cut it down, he advised them to consecrate it to Christ and allow its continued worship. (Information source)
I don't know who doesn't like this holiday shared by many! However you celebrate, have a great day!