According to Bimba-pratibimba-vāda(बिम्ब-प्रतिबिम्ब-वादम्/Theory of Reflection), Suddha Māyā(Māyā associated with Sattva Guna) and Asuddha Māyā (Avidyā/अविद्य/Māyā associated with tamo guna) act like reflecting media. When Brahman is reflected in Suddha Māyā, it becomes Īśvara and is known as Saguna brahman(सगुण ब्रह्मन्/Qualified Brahman). Though Īsvara is also a Ĵivātman like us, but unlike us, He is the purest and the most virtuous soul attached with Prakriti with Sattva Guna. So Māyā(माया/Prakriti/Illusion) becomes subservient to Īsvara rather than veiling Brahman.
How does Īsvara (ईश्वर) carry out His Duties? Creation, sustenance and destruction of the Universe with the help of Māyā(माया/Prakriti/Illusion) are the Three Duties as described below:
- Īsvara (ईश्वर) is God Brahma(ब्रह्म/பிரம்மா) while creating the Universe and the Māyā is called Goddess Saraswatī(सरस्वती) who is more of Rajo Guna(रजोगुण/Activity/Passion) required in order to carry out creation.
- Īsvara (ईश्वर) is God Vishnu(महाविष्णु/மஹாவிஷ்ணு) who sustains the Universe and the Māyā is known as Goddess Lakshmī(लक्ष्मी) who is more of Sattva Guna(सत्वगुण/Pure/Goodness/Soft/Compassionate and Forgiveness) required in order to carry out sustenance.
- Īsvara (ईश्वर) becomes God Rudra(रुद्र/ருத்திரன்) who destroys the Universe and the Māyā is none other than Goddess Pārvatī(पार्वती) who is more of Tamo Guna(तमोगुण/Ignorance/Destruction/Chaos) required in order to carry out destruction.
Beware: Except Brahman(ब्रह्मन्/The Absolute) rest are all Ĵivātmans including Gods.
The Śvetāśvatara Upanishad (श्वेताश्वतर उपनिषद्) says the exact location of Ātman Who is in the space of the Heart with size as follows:
अङ्गुष्ठमात्र: पुरुषोsन्तरात्मा|
सदा जनानां ह्यदये संनिविष्ट:|
ह्युदा मन्विशो मन्सभिक्लुप्तो|
य एतद्विदुरमृतास्ते भवन्ति ||13||
The Purusha, no bigger than a thumb, is the inner Self, ever seated in the heart of man. He is known by the mind, which controls knowledge and is perceived in the heart. They who know Him become immortal.
—Śvetāśvatara Upanishad, 3.13
Like Śvetāśvatara Upanishad [3.13], the ancient classics also believe that Ĵivātman resides in the Anāhata Chakra(अनाहत चक्र/Heart Chakra) of Sūkshma Sarīra(सूक्ष्म शरीर/Subtle body) with a size of no bigger than a thumb.
What is Brahman(ब्रह्मन्)? Brahman is Paramātman(परमात्मन्/Supreme Spirit/The Absolute) Who is Nirguna(निर्गुण/Unattached with Guna), Akandākāra(अखण्डाकार/Infinity), Asarīra (अशरीर/Incorporeal/Bodiless) and Whose swarūpa(स्वरूप/Nature) is Satchitānanda (सच्चिदानन्द).
Except Brahman(ब्रह्मन्/Supreme Soul), you, me, Īsvara, Brahma,
Vishna, Rudra and other Devas are all Ĵivātmans whose size is no bigger
than a thumb and residing in Anāhata Chakra of Sūkshma Sarīra.
I) Your first question How Can Multiple Infinite size Gods Exist Without Overlap in Hinduism?
Except Brahman(ब्रह्मन्/Supreme Soul), no God is infinite so overlap can never happen!
Gods are Ĵivātman whose size is no bigger than a thumb in accordance with Śvetāśvatara Upanishad [3.13]. But with the assistance of Māyā(माया/Prakriti/Illusion), Gods can assume any form such as Visvarūpam and any other Ashta Siddhi.
II) Your second question In Hinduism, deities like Brahman, Vishnu, Shiva, and others are often described as infinite and omnipresent. However, this raises a conceptual question:
Except Brahman, Īsvara(Sakuna Brahman), Brahma, Vishna, Rudra are not infinite but they are Omnipotent(सर्वशक्तिशालिन्) and All Pervading(विश्वकव्यापिन्) because of the assistance of Māyā.
III) Your third question If multiple gods are infinite in size and presence, how is it possible for them to coexist without overlapping or contradicting each other? Wouldn’t their infinite natures create conflicts or redundancy?
Except Brahman(ब्रह्मन्/Supreme Soul), no God is infinite so overlap can never happen! Therefore no conflict will ever arise.
IV) Your fourth and final question I’ve read that Brahman is considered the ultimate, all-encompassing reality, but I’m still confused about how other infinite deities fit into this framework. Could someone explain this from a scriptural or philosophical perspective.
Prakriti is Māyā or illusion who is primordial nature and represents three Gunas viz., Sattva, Rajo and Tamo.
Brahman is truth Who exists without second, whose swarupa is Sat-Chit-Ananda and whose chaitanya (चैतन्य/consciousness) is reflected as Jivatmans by Māyā as upādhi (उपाधि/Limitation) in all human and non-human entities including all Gods.
Keep in mind that Brahman is chaitanyam (चैतन्यम्/consciousness) and nothing to do with omnipotency. It is Saguna Brahman Īsvara (also Trimurties) who is omnipotent because of association of Māyā. Without Māyā there is no Omnipotency.
Only one who is unaffected with Māyā is Brahman, so there is no omnipotency applicable to Brahman; He is beyond everything, all pervading as chaitanyam and stands alone without a second!
Beware: Like a snake exists together inseparable with its poison but at the same time unaffected with its[poison] presence, Brahman
exists together inseparable with Māyā [dependent reality] but at the
same time unaffected with its[Māyā] presence.
Conclusion:
Except Brahman, no Ĵivātman (human and non-human entities including all Gods) is infinity whose size is no bigger than a thumb [refer Śvetāśvatara Upanishad, Ch-3, Sloka-13]. So the issue of overlap will never occur!