Question: Indra, is a Vedic deity in Hinduism, a guardian deity in Buddhism, and the king of first heaven called "Saudharmakalpa" in Jainism, his mythologies and powers are similar, to those of the Indo-European deities such as which sky and thunder god in ancient Greek religion, who ruled as king of the gods of Mount Olympus?

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Hindu–Islamic relations: Hinduism is a diversity-filled socio-religious way of life of the Hindu people of the Indian subcontinent, their diaspora, and some other regions which had Hindu influence in the ancient and medieval times.  In Hinduism God can be worshiped in the name one believes or in the form one believes and allows idol worship, hence Hinduism's concept of God does not contradict the concept of Allah, the Islamic God.  Islam is a monotheistic religion in which the supreme deity is Allah (Arabic: الله‎ ‎ "the God" : see God in Islam), the last Islamic prophet being Muhammad, whom Muslims believe delivered the Islamic scripture, the Qur'an.  Hinduism mostly shares common terms with the "dhārmic" religions, including Buddhism, Jainism and Sikhism.  Islam shares common terms with the Abrahamic religions–those religions claiming descent from Abraham–being, from oldest to youngest, Judaism, Christianity, Islam, and Baha'i Faith.

Dionysus in comparative mythology: Dionysus, the god of wine, theatre, and ecstasy in ancient Greek religion, has been compared to many other deities, both by his classical worshippers and later scholars.  These deities include figures outside of ancient Greek religion, such as Jesus, Osiris, Shiva, and Tammuz, as well as figures inside of ancient Greek religion, such as Hades.

Indra: Indra ( , Sanskrit: इन्द्र) is a Vedic deity in Hinduism, a guardian deity in Buddhism, and the king of first heaven called "Saudharmakalpa" in Jainism.  His mythologies and powers are similar, though not identical to those of the Indo-European deities such as Zeus, Jupiter, Perun, Thor, and Odin (Wotan).

List of thunder gods: Polytheistic peoples of many cultures have postulated a thunder god, the personification or source of the forces of thunder and lightning; a lightning god does not have a typical depiction, and will vary based on the culture.  In Indo-European cultures, the thunder god is frequently known as the chief or king of the gods, e.g. Indra in Hinduism, Zeus in Greek mythology, and Perun in ancient Slavic religion; or a close relation thereof, e.g. Thor, son of Odin, in Norse mythology.  This is also true of Shango in Yoruba religion and in the syncretic religions of the African Diaspora, such as Santería (Cuba, Puerto Rico, United States and Candomblé (Brazil).

Guardians of the directions: The Guardians of the Directions (Sanskrit: दिक्पाल, Dikpāla) are the deities who rule the specific directions of space according to Hinduism and "Vajrayāna" Buddhism—especially Kālacakra .  As a group of eight deities, they are called Aṣṭa-Dikpāla (अष्ट-दिक्पाल), literally meaning guardians of eight directions.  They are often augmented with two extra deities for the ten directions (the two extra directions being zenith and nadir), when they are known as the Daśa-Dikpāla .  In Hinduism it is traditional to represent their images on the walls and ceilings of Hindu temples. Ancient Java and Bali Hinduism recognize Nava-Dikpāla , literally meaning guardians of nine directions, that consist of eight directions with one addition in the center.  The nine guardian gods of directions is called "Dewata Nawa Sanga" (Nine guardian devata).  The diagram of these guardian gods of directions is featured in Surya Majapahit, the emblem of Majapahit empire.

Zeus: Zeus ( ; Greek: Ζεύς "Zeús" ] ) is the sky and thunder god in ancient Greek religion, who ruled as king of the gods of Mount Olympus.  His name is cognate with the first element of his Roman equivalent Jupiter.  His mythologies and powers are similar, though not identical, to those of Indo-European deities such as Indra, Jupiter, Perun, Thor, and Odin.

Varuna: Varuna ( ; IAST: "Varuṇa " वरुण , Malay: "Baruna") is a Vedic deity associated first with sky, later with waters as well as with Ṛta (justice) and Satya (truth).  He is found in the oldest layer of Vedic literature of Hinduism, such as the hymn 7.86 of the "Rigveda".  He is possibly one of the earliest Indo-Aryan triads with parallels to a Avestan deity, possibly Iranian Ahura Mazda.  His streak of demonic violent tendencies, according to Hindu mythology, led to his demotion and Indra taking away most of his powers.

Prajapati: Prajapati (IAST: "Prajāpati-Rajjan or Rajanya ", "lord of creatures and protector") is a Vedic deity of Hinduism.  The term also connotes many different gods, depending on the Hindu text, ranging from being the creator god to being same as one of the following: Brahma, Vishnu, Shiva, Agni, Indra, Vishvakarma, Bharata, Kapila and many others.  According to George Williams, the inconsistent, varying and evolving Prajapati concept in Hindu mythology reflects the diverse Hindu cosmology.  In classical and medieval era literature, Prajapati is equated to the metaphysical concept called Brahm as Prajapati-Brahm (Svayambhu Brahm), or alternatively Brahm is described as one who existed before Prajapati.

Pegasus: Pegasus (Ancient Greek: Πήγασος , "Pḗgasos"; Latin: "Pegasus, Pegasos" ) is one of the best known creatures in Greek mythology.  He is a winged divine stallion usually depicted as pure white in color.  He was sired by Poseidon, in his role as horse-god, and foaled by the Gorgon Medusa.  He was the brother of Chrysaor, born at a single birthing when his mother was decapitated by Perseus.  Greco-Roman poets write about his ascent to heaven after his birth and his obeisance to Zeus, king of the gods, who instructed him to bring lightning and thunder from Olympus.  Friend of the Muses, Pegasus is the creator of Hippocrene, the fountain on Mt. Helicon.  He was captured by the Greek hero Bellerophon near the fountain Peirene with the help of Athena and Poseidon.  Pegasus allows the hero to ride him to defeat a monster, the Chimera, before realizing many other exploits.  His rider, however, falls off his back trying to reach Mount Olympus.  Zeus transformed him into the constellation Pegasus and placed him up in the sky.

Kshetrapala: Kshetrapala is a guardian deity in Jainism, Buddhism and Hinduism.  According to Hinduism and Hindu mythology, Kshetrapala, that is, the lord of the farmland, is a deity who was originally a deity of the farmland, particularly in the south India.  Over a period of time, Kshetrapala became a generic name applied to deities associated with a piece or parcel of land, or a particular region (kshetra in Sanskrit).  His temples are generally constructed on the northeastern corner of temples devoted to Shiva, and he is worshipped prior to each ritual to ensure the efficacy of that particular ritual.

Supporting paragraphs: Indra Zeus
Answer: Zeus