You asked where is the Buddha,and did he crwate the cosmos.
My reply:if you are implying nhilism,and anhilation of the existing being then,all i can say is the Buddha taught thoae things were wrong view,the Buddha never taught that life ceases not once not ever.The Buddha stated that after death their is always the continuation of an existing being,whether its eternal life in rebirth,or eternal life as the Buddha life itself is eternal.their is no nhilism,or anhilationism doctrine in Buddhism its simply listed as wrong view.
With that said the Buddha is eternal,everlasting,unborn,and uncreated and as he stated the teacher of immortality so where do you think he is?
As far as the cosmos is voncerned the cosmos is samsarasan its not of the Buddha its of mara,and have u ever heard of emanationIsm?more in line with karma than creatiSm.
Lastly the TOS is do Buddhists belive in god the answer is YES
You mono and poly ideas of god or gods either way they are still gods whether its the god odin or the god of the bible or the gods in buddhism.
And an atheist doesnt belive that a god exists PERIOD,whether is mono or poly idea of god or gods,
An agnostic is one one states a god Might exist.
So no we are not atheists,also gods in Buddhism are literal not metophoric if you want ill let the suttas tell you that for me?