Monotheism

Monotheism is the belief in only one god, rather than the two (dualism) or more (polytheism) as in Ancient Greece, Ancient Rome and Ancient Egypt.

Deism is the belief that a higher being like god exists but not many gods, revelation, religions, rituals, sacred books (like the Bible or Quran), prophets (like Jesus or Muhammad), etc.

Judaism and Zoroastrianism are thought to be the oldest living monotheistic religions.

Monotheism Media

Pharaoh Akhenaten and his family adoring the Aten
Shang dynasty bronze script character for tian (天), which translates to Heaven and sky
Fictionalized portrait of Xenophanes from a 17th-century engraving
Remains of the Temple of Apollo at Delphi, Greece
Baháʼí House of Worship, Langenhain, Germany
The Trinity is the Christian belief that God is one God in essence but three persons: God the Father, God the Son (Jesus), and God the Holy Spirit.
God in The Creation of Adam, fresco by Michelangelo (c. 1508–1512)
Arabic calligraphy reading "Allah, may his glory be glorified"
The tetragrammaton in Paleo-Hebrew (10th century BCE to 135 CE), old Aramaic (10th century BCE to 4th century CE), and square Hebrew (3rd century BCE to present) scripts
درفش مندائي darfash mandaean

This short article about religion can be made longer. You can help Wikipedia by adding to it.