The discussionsare interesting.But one must remember that there is a power called Kundalini which is equivalent to the cosmic power which is lying dormant in everbody which when awakened thru rigorous practice and discipline under the tutelage of a very learned Guru can release great powers and siddhis and can be utilised for beneficial and destructive powers.The so called ashtras are nothing but the power which is passed on the subject by mantra recital by adepts in that art.whether the same is true or not can't be explained as the spiritual matters can't be tested in labaratories but only thru experience over several years of practice.
Regarding creation it is said that Lord Vishnu lyig in a reclined position over
thousand headed serpent brings out thru his umbilical chord Brahma who has been assigned the job of creation.At that point Lord Vishnu is surrounded by ocean of milk which can be compared to the cosmic ocean.The etrenal brahman who is the source of the universe has no beginning or end.Brahma is suppose to be lying inside the cosmic egg which is known as the prakriti,.He is also known as Hiranya garbha as hiranya denotes Life-Light principle and vibrates within him.It is believed that the cosmic egg contains all the worlds,ocans,earth,stars,sun,Moon,planets etc.To be precise it is believed
that the entire universe lies within the cosmic egg totally in a dormant state.This egg is covered by sheets nadeof four elements of fire,water,air and space.So Brahma who is also inside disturbs the three ginas rajas,tamas,and sattvic which are in equilibrium and created the firstprinciple
kniown as Mahat or the Great or First atom of the Universe.This is the process of creation.
Lord Vishnu who is pervading everywhere takes the responsibilty of all the aspects of creation,protection and destruction by assigning the jobs to brahma and siva and himself and hence He is considered as Supreme Being without a second.This is amply illustrated when He is called Vishwaroopa
swaroopa.He is the One and Only Being always in existence and all other so called universes,beings all are embedded in Him always and within Him only all the processes take place.