Q. What end does this book serve the believer/unbeliever that His Word the Bible, and His Spirit in us, does not?
The title - Heaven is for Real. This is a given to the believer who reads and believes the Bible. The title assumes we need further revelation than the Word of Truth we have received from above.
As christians we walk by faith and not by sight. That faith shall one day be sight but not now. That faith is evidence and assurance of things not seen.
This book and all books of this nature are all suspect at the least.
Lazarus or others whom Jesus raised from death back to this life, very well could have given a true account of that place called heaven, but the Holy Spirit did not see fit in having it so. Paul could have as well, but the Holy Spirit instructed him not to do it, that it was even unlawful for him to speak about those things (2 Cor. 12:4).
Do we not have enough written by the Holy Spirit through John in Revelation describing that beautiful place called heaven! If we're not satisfied with what the Holy Spirit has chosen to reveal, then we may end up as Saul trying to get a glimpse into the other side through unlawful means. And we just may get our hearts unlawful passions satisfied!
As for the unbeliever, it is more of a distraction from his real need of the Gospel, in its convicting power to convert the soul of the sinner, commanding repentance and faith in Jesus alone for his assurance of an abundant entrance into that place we call heaven.
Books of this sort are as popular as the magazine,"The Inquirer". The stories and descriptions will certainly peak your interest, and that is why they're selling like hotcakes and there will be no end to new ones written on heaven as well as hell visitations. Some are certainly more believable than others,and that's no surprise,because such is the nature of subtilty.
How Legitimate is it? You ask! Its legitimacy ought to be discerned as the word (legitimate) itself implies, by its,
1. Lawfulness of birth; opposed to bastardy.
2. Genuineness; opposed to spuriousness. (Webster)
For we did not follow cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but we were eyewitnesses of his majesty. For he received from God the Father honour and glory, when there came such a voice to him from the excellent glory, This is my beloved Son, in whom I am well pleased: and this voice we ourselves heard come out of heaven, when we were with him in the holy mount. And we have the word of prophecy made more sure; whereunto ye do well that ye take heed, as unto a lamp shining in a dark place, until the day dawn, and the day–star arise in your hearts: knowing this first, that no prophecy of scripture is of private interpretation.
For no prophecy ever came by the will of man: but men spake from God, being moved by the Holy Ghost. 2 Pet. 1:16-21
If anyone says I speak too boldly and my statements are presumptuous judgements...I ask you who think so...what does this book and books like it do?