Arianism

Early in the history of mankind when Jesus was alive he communicated as man. In the end soon after the resurrection and the post resurrection period, period showed himself to be God. Now those whop proclaimed Jesus as God was forced to declare God as Trinity. This created a problem between Monotheism and Polytheism. Is Christianity Monotheistic or Polytheistic. This was the struggle in the early Christian period. Arius was one who came up with one answer as many others. What did he propose. Is it a valid explanation. Is it heresy. Where do we place Arianism. Who are the Arians today?