These are intellectual questions looking for religious answers. They cannot be answered fully by science or from sources of knowledge other than the Bible. Cults attempt to answer these questions for people, often trying to impress with teachings about ancient languages that may not be accurate. Some of the cults make an issue of supposedly using scientific methods to know God or to attain special knowledge of the true God. All this is an attempt to satisfy the intellectual yearnings that we bring to religion.
Emotions play a part in everyone's life.
This varies from person to person, but emotions are important to all of us. Christ can heal the emotional hurts and needs that we have. Cults take advantage of hurt feelings and emotions that we bring from our past. They try to give a false love in the place of the agape love that Christ has for us. In the beginning, God created us to be social, to desire fellowship with others.