Placid means not easily upset or excited, calm and peaceful, with little movement or activity. It is synonymous with quiet, calm, tranquil, still, peaceful, undisturbed, equable, unexcitable, serene, mild, steady, and unperturbed. Mainstream Christianity today easily meets the definition of placid. Not wanting to make any waves, not wishing to rock the boat, its centrist members comfortably and easily integrate into the society around them. Each wants to establish and protect his own little kingdom. If you were to rock the boat then you stand to lose what you have, or not advance in rank or position -- so tolerance and compromise are tacitly approved.