@Aniduan said: “I am having difficulty accepting the 31 realms theory i.e. Buddha’s world view.”
The 31 realms with our mundane mind might seen illusionary with the hell realm or the heaven realm (includes deva and brahma realms). In this human realm that we live in, we can experience what the hell realm are experincing when we are suffering pain (though may not be as worst as in niriya realm) and also the heaven realm when we experience happiness (as in deep state of meditation or just joyful sensure pleasure). As the saying goes “heaven and hell is in this world” as we experienced both.
To know more about 31 realms, reading this book “The Thirty-One Planes of Existence” by Venerable Bhante Suvanno and the article “The Thirty-One Planes of Existence” at “www.accesstoinsight.org” helps.