Wales History of Religion. Before Christianity and arrival of Christianity. Before Christianity arrived in Wales, archaeological evidence shows the existence of a variety of religious beliefs and rituals. Evidence of the existence of the pre-historic peoples of Wales is to be found all over the country, literally on the ground as well as under it, and much of this relates to the burial of human remains. Many sites have similar characteristics, making a strong case for the existence of a common belief system throughout the area during various periods, particularly when dealing with death. Perhaps this is why pre-historic religions have such a morbid image - for example the popular images of bloodthirsty Druidic sacrifices. Evidence of rituals for marriages and births is not so widespread, or has yet to be identified as such.