Rig veda being pragmatic.

Vedic civilization created its scriptural knowledge in rational world. Rigveda discussed everything including origin of universe and origin of Gods and made questions wherever required and noted down uncertainty and possibility where knowledge might go wrong. 129th hymn of the 10th Mandala of the Rigveda (10:129) is concerned with cosmology and the origin of the universe. The Nasadiya Sukta  also known as the Hymn of Creation. 

को अद्धा वेद क इह प्र वोचत्कुत आजाता कुत इयं विसृष्टिः ।
अर्वाग्देवा अस्य विसर्जनेनाथा को वेद यत आबभूव ॥६॥

But, after all, who knows, and who can say
Whence it all came, and how creation happened?
the gods themselves are later than creation,
so who knows truly whence it has arisen?

इयं विसृष्टिर्यत आबभूव यदि वा दधे यदि वा न ।
यो अस्याध्यक्षः परमे व्योमन्त्सो अङ्ग वेद यदि वा न वेद ॥७॥

Whence all creation had its origin,
he, whether he fashioned it or whether he did not,
he, who surveys it all from highest heaven,
he knows - or maybe even he does not know.