What's wrong with this logic?

Picture God giving you a book about your life and in the book, it tells you exactly when you will die. You can't trade that book in just because you don't like how and when it ends. This is why it's important for you to build a personal relationship with Jesus Christ.

The given passage contains several logical fallacies and instances of poor reasoning:

1. **False Analogy**: The passage compares the concept of a predetermined life course, as depicted by a book that tells you when you will die, with the necessity of building a personal relationship with Jesus Christ. However, the analogy fails as it equates two inherently different things — one's life fate and a religious relationship — and assumes that understanding one automatically necessitates the other. This oversimplification ignores complexities and nuances.

2. **Non Sequitur**: The conclusion—that it is important to build a personal relationship with Jesus Christ—does not logically follow from the premises provided. Even if one accepts the premise that their life is predetermined and unchangeable, it doesn't logically lead to the need for a personal relationship with Jesus Christ as a remedy or solution. The passage lacks clear logical steps linking the idea of an unchangeable fate to the necessity of a specific religious relationship.

3. **Appeal to Fear**: The passage implicitly leverages fear — the fear of an inevitable and possibly undesirable death — to persuade readers to build a personal relationship with Jesus Christ. This tactic can be seen as manipulative, as it plays on the reader's emotions rather than presenting a rational argument for the religious relationship.

4. **Begging the Question**: The argument presupposes the value and truth of building a personal relationship with Jesus Christ without providing supporting evidence. It assumes what it is trying to prove, leading to circular reasoning.

5. **Existential Claim without Evidence**: The premise that a book exists that details exactly when and how a person will die is a significant claim without provided evidence. This makes the foundation of the argument speculative and weakens the overall logical structure.

6. **Loaded Terminology**: The term "important" in "it’s important for you to build a personal relationship with Jesus Christ" carries subjective judgment without objective basis in the given context. Importance is asserted rather than demonstrated through logic.

In summary, the passage uses poor logic and several fallacies to tie the concept of predetermined fate to the necessity of a religious relationship, without providing a rational bridge or supportive evidence for this connection.

Back to basics. Did you ever get an intelligible definition of this fearsome god?

This is just a complete non sequitur argument, and the premise that it's built on isn't even that good.

The first two sentences are presenting a pure hypothetical about God giving you a book about your life, but it seems the point that is to be taken from it is that the time and manner of your death is predetermined, and you have no power in changing that. Which is flawed in the sense that, we know based on medical research that you can make health choices that can extend or shorten your life. Or that you could just wake up one morning, decide that today will be your last day, and jump in front of a train. What is true is that we do have some sort of hard limit on our lifespans, and the best we can do is get closer to it. However, this is true of not only every person, but of every animal, plant, and single-cell organism out there. Also, it remains true whether or not Jesus is God, or whether God exists at all.

But, the core argument here: God controls how you will die, therefore it's important to have a personal relationship to Jesus. There's no thread of logic that I can find that connects those two statements together.