Although caramel is correct in which some sikhs are and others aren't.
But let's take the ideal Sikh,
Sikhs are supposed to be free-thinkers. Sikhi by reading the scriptures creates a foundation of knowledge to grow on.
Guru Gobind further explained this point by creating the Khalsa -- brotherhood dedicated to purity of thought and action.
Guru Gobind then took amrit from the members initiated into the Khalsa (Panj Pyare), clearly shows that not even the Guru should stop contemplating and stop thinking and searching for the truth, he just provided the base for us, to continue and expand our own knowledge.
Making Sikhi a free-thinkers place to be