Eph 2:5 even when we were dead in trespasses, made us alive together with Christ (by grace you have been saved),
Eph 2:6 and raised us up together, and made us sit together in the heavenly places in Christ Jesus,
Eph 2:7 that in the ages to come He might show the exceeding riches of His grace in His kindness toward us in Christ Jesus.

The above passage is referring to our position in Christ, as in the state of our soul, being saved, and now we are identified with Him, through His death, and made truly alive in Him, as he overcame death itself. It has nothing to do with "going to heaven" as in a sensual experience. We have overcome death, through Him...so we share that eternal place with Christ, and have defeated the "powers and principalities"...through Him... that once had dominion over us!
In the ages to come we most certainly will in our glorified bodies share the heavenly realms and know in full the exceeding riches of His grace.
A true visitation to the heavenly realms, such as Paul described, was a sovereign act of the Lord. It was not something that was 'willed" on his part.
I have had many, many "astral' type experiences back in the early 70's late 60's when I was involved in new age stuff...a lot of that testimony is at www.sapphirethrone.com
it is too much to go into here. All that may happen to a believer that is of God is through the Holy Spirit, as Mishel explains. We do not manipulate the Holy Spirit! Or its not the Holy Spirit! I have had numerous prophetic dreams as a born again believer, and each has come true, but it was nothing I sought...they were given, and always for a purpose, as to encourage my faith, or pray for something that was to happen, such as an earthquake. Bentley is teaching people how to manipulate their way into an "experience" that is soulish...they contact the fallen demonic realm, which, by it's nature, is deception. The supernatural events in my life are mostly through God's timing ...and there is no way to be in the right place at the right time for prayers to be answered, or blessings to come through, without a relationship with Him that is pleasing to Him! It has to be done His way! Not through manipulation! A crucified life in Christ and picking up our cross and following Him is really not a very popular theme...He said the road would be narrow. The true presence of God is not like anything Bentley is expounding....I pray he is delivered of what he is into, and comes to a right relationship with Messiah...Christ Jesus.