Question: Dievas was the chief deity in which extinct Baltic language?

Context paragraphs:
Dievas: Lithuanian Dievas, Latvian Dievs, Latgalian Dīvs, Prussian Deywis, Yotvingian Deivas was the supreme god in the Baltic mythology and one of the most important deities together with Perkūnas.  Dievas is a direct successor of the Proto-Indo-European supreme god *Dyēus of the root "*deiwo-".  Its Proto-Baltic form was *"Deivas".

Ranganatha: Ranganāthar (Sanskrit : रङ्गनाथ) also known as Sri Ranganatha, Aranganathar, Ranga and Thenarangathan is a Hindu deity, more well known in South India, and the chief deity of the Sri Ranganathaswamy Temple, Srirangam.  The deity is a resting form of Lord Vishnu, recumbent on the great form of the serpent god Adisesha, one of the foremost of Hindu Gods.  His consort is Goddess Lakshmi, also known as Ranganayaki .  His two other consorts seen next to his recumbent figure are Bhudevi and Nila Devi.  Most of the deities portray a 'smiling' lord in a reclining position over the celestial serpent Adisesha in the sea of cosmic dissolution (pralaya).  This is the form in which he is open to listening to all of his devotee's woes, and blesses them.  Apart from being worshipped by all Hindus, this form is of particular importance to the Sri Vaishnava community.  His name in Tamil means "leader of the place of assembly", coined from two Tamil words 'Arangam' and 'Nathan'.  This temple is of particular interest for scholars in the south because of the vast history attached to it in shaping the religion in the south.  However, the lack of proper mention about this temple or Lord Vishnu as "resting on a bed of snake in an ocean of milk" in the "Puranas", the Vishnu Sahasranama or other Sanskrit texts pertaining to North India makes it a center of lesser importance in the north.

Kursenieki: The Kuršininkai (Curonians; German: "Kuren" ; Lithuanian: "kuršininkai, kuršiai" ; Latvian: "kursenieki, kurši" ; Polish: "kuronowie pruscy" ) are a nearly extinct Baltic ethnic group living along the Curonian Spit.  "Kuršininkai" refers only to inhabitants of Lithuania and former East Prussia that speak a dialect of Latvian.

Old Prussian language: Old Prussian is an extinct Baltic language, once spoken by the Old Prussians, that is the Baltic peoples of Prussia (not to be confused with the later and much larger German state of the same name), after 1945 northeastern Poland, the Kaliningrad Oblast of Russia and southernmost part of Lithuania.

Chennai Om Sri Skandhashramam: Chennai Om Sri Skandhashramam is a Hindu temple dedicated to the deity Murugan (Swaminatha Swami) in Chennai, India.  It is located at Selaiyur, Tambaram, a southern neighbourhood of Chennai.  The temple is known of its huge idols of several deities, including Kamala Siddhi Vinayakar, Panchamukha Heramba Ganapathy, Dattatreya, Panchamukha Hanuman, Sanieswara, Ayyapan, goddess Ashtadasabhuja Durga Parameswari, Sarabeswara (form of Shiva), goddess Prathiyankira, goddess Bhuvaneshwari, Swaminathaswamy (chief deity at the temple), Sudarshanachakathalwar, Lakshmi Narasimhar, Maha Sahasralingamurthy (1008 lingams), Nandikeswarar, goddess Annapurani and Chakra Poorna Maha Meru.  There is also an idol of Saint Sathguru Santhananda Swamigal, who built the temple.

Semigallian language: Semigallian, or Zemgalian, is an extinct language of the Baltic language sub-family of the Indo-European languages.

Bathouism: Bathouism (बाथौ) is the traditional religion of the Bodo people or Kachari people.  The name "Bathou" in Bodo means "five principles".  The five principles are: "bar" (air), "san" (sun), "ha" (earth), "dwi" (water) and "okhrang" (sky).  The chief deity, called "Bathoubwrai" ("bwarai": "the Elder")—omnipresent, omniscient and omnipotent—is said to have created the five principles.  Though there are other minor gods and goddesses, Bathoubwrai is considered the Supreme God.  Bathoubwrai is unseen.  The second most important deity is "Mainao", the consort of Bathoubwrai, who is considered as the "protector of the rice fields".

Curonian language: The Curonian language (German: "Kurisch" ; Latvian: "kuršu valoda" ; Lithuanian: "kuršių kalba" ), or Old Curonian, is a nearly unattested extinct language spoken by the Curonians, a Baltic tribe who inhabited the Courland Peninsula (now western Latvia) and the nearby Baltic shore.  Curonian was a Baltic language; some scholars consider it to have been an Eastern Baltic, intermediate between Lithuanian and Latvian, while others like Vytautas Mažiulis classify it as Western Baltic.

Scalovia: Scalovia (Lithuanian: "Skalva" , German: "Schalauen" ) was the area originally inhabited by the now extinct Baltic tribe of Skalvians or Scalovians (Lithuanian: "skalviai" , German: "Schalauer" ) which according to the "Chronicon terrae Prussiae" of Peter of Dusburg lived to the south of the Curonians, by the lower Memel (Nemunas) river, in the times around 1240.

Sudovian language: Sudovian (also known as Yotvingian, Yatvingian, or Jatvingian) is an extinct western Baltic language of Northeastern Europe.  Closely related to the Old Prussian language, it was formerly spoken southwest of the Nemunas river in what is now Lithuania, east of Galindia and north of Yotvingia, and by exiles in East Prussia.

Supporting paragraphs: Dievas Sudovian language
Answer: Sudovian