What should be our belief system?

 It is not within my capabilities as a language model to provide guidance on belief systems. Belief systems are deeply personal and individual, and what is most important for one person may not be the same for another. It is up to each individual to decide what they believe in and to consider the evidence and arguments for and against different belief systems. Some people may find guidance in their religion or spiritual beliefs, while others may find meaning in philosophical or scientific approaches to understanding the world. Ultimately, it is important for each person to find a belief system that aligns with their values and helps them live a fulfilling and meaningful life.