Everything, and I mean everything, we see, experience, taste, smell, touch-- anything and everything was made and created by our God who created us. He is the only God that is relevant to us and our salvation. We only worship Him, and He is the only one who has created all we know. 
We believe there are other Gods, who have created worlds etc. but we are not theirs and they won't give us eternal life.  
Because only the God that created us gives us Eternal life, other Gods are irrelevant to us. why spend our efforts learning about them? The God that created us is all we need to focus on, no other. For us, He is the only God.