There is nothing special about Sikh religion nor beliefs.
What is different, is that the Holy Book, the Guru Granth Sahib, the Sikh scriptures, is their guru.
Sikhs believe there is one God, Hari, and he is God of all. All can reach God by following the Golden Rule, loving and serving neighbour, and by reading and reciting the scriptures. God must be sought above all things, in this world.