Does astral travel is necessary for entering into the kingdom of the God. if yes then please explain why?

Astral traveling means traveling within your "emotional" body which is a necessary step to evolving into higher realms. But you must realize the the astral realm is nothing more than the emotional body of Earth and is still bound by the laws of duality (polarity).,,,....beyond the astral realm is the causal realm where memories and the book of life can be found and beyond that is the abstract mental where genius or madness can occur. What we should really strive for is the Soul realm where all that is dual becomes one, where thought ceases to exist and "being" becomes everything.