Giving this book three stars does not mean I think it is "worse" than Gone Girl. In fact the protagonists of that novel could have tried reading it before they got married, though there is something incorrigible about them that doesn't inspire confidence. No, this gets three stars in relation to a rather different set of intellectual, moral and aesthetic fields.
What is it? Well, it is largely made up of questionnaires or worksheets designed to get people to reflect on themselves, their backgrounds, their hopes, their expectations, what have you. Taken together they are pretty comprehensive, and if taken seriously and discussed in a grown-up way with the person you are planning to marry, and even better in a foursome/group with some people who have been married for a while so might have some wisdom on the subject, then there is much profit in them. [We have done bits of marriage counselling, marriage preparation, theological teaching about relationships in Britain and in China over the years, and are using this book as a framework at the request of the couples we are currently meeting with, partly because it is available in a cheap Chinese edition at the moment, so I have a certain amount of theoretical and experiential knowledge in this area, though expertise is far off.]
"Preparing for Marriage" contains some light commentary on the questinonaires, some prompts, and sensible advice. A book like this ought to be getting five stars: there is a lot of good stuff here, and it seems pitched fairly well for people who don't love reading, so I'm not going to criticise it for being too slight - it's aiming to catch a wide audience, and Rainey and his editors can't be expected to aim at academics in their writing style or the fanciness of their content. Also in its favour is chapter two, on what getting/being married means: accepting your spouse (attitude of continual acceptance, trust in God, not criticism of bad habits); leaving your parents (dependence and allegiance); cleave to your spouse (framework and stance of unconditional commitment, anything else breeds anxiety and mistrust); becoming one flesh (plenty of sex but pursue a oneness that is beyond that). So far so orthodox, and helpful.
Alas the main flaw was in chapter one. How you can write a Christian book about marriage and never refer to Ephesians 5, which, among other things, says: "Husbands, love your wives as Christ loved the church, and gave himself up for her..."!? There is so much theology, ethics and psychology involved in unpacking that verse, and it is soooo foundational for a Christian view of marriage, and yet the book of Ephesians is never even mentioned by Rainey! Instead, he builds almost the whole constructive theological content (which is slender in this book, but, again, the problem is not really the brevity so much as the massive lacunae) on a partial misreading of the opening chapters of Genesis.
Chapter One, "Why Marriage?", tells us of the three purposes of marriage: 1. mutually complete one another; 2. multiply a godly legacy; 3. mirror God's image. To be blunt, 1. is simply false, and is uncritically based on some derivative romanticised pop-culture anti-Christian psycho-anthropological model of personhood (nb. unmarried people are perfectly "complete"; the Son of God incarnate being a fairly useful example if we need to go there). 2. is actually OK, and Rainey briefly allows for infertility and couples being involved in the nurture and care of others, young and old. 3. another major booboo here, he simply doesn't get what Genesis says about the image of God (representative rule, delegated authority, stewardship, the individual-in-community, might be able to stretch it to discuss gender diversity, even creativity, etc, etc cf. millennia of theological discussion about this...) if he thinks that the marriage relationship mirrors this in any special way. Biblical-theological writing about the marriage relationship is never linked to the image of God; had Rainey got as far as Ephesians (see above) he would have seen that there are indeed vitally important Christian teachings that are linked to marriage, but if you close the Bible after looking at its first few pages you aren't going to spot that. To be clear, single people as fully bear the image of God as married people do.
As an interesting comparison, here are the purposes of marriage according to two versions produced by a certain venerable Protestant denominational family:
1559
1. Procreation and nurture of children.
2. Remedy against sin and fornication.
3. Mutual society, help and comfort.
1979
1. Mutual joy (a much more positive way of expressing 1559.2!)
2. Help and comfort.
3. Procreation and nurture.
The same purposes, just in a different order. Whether one order is more Biblical and more truly Christian, or each is in this respect simply a reflection of its age, I pass over without comment ;-)
Rainey's book is at this point definitely reflecting a contemporary kind of christianity-lite. Yup, small 'c'. Maybe that's an attempt to broaden the readership, indeed much of this book could be read and used by plenty of non-Christians or cultural Christians or whatever mainstream US society is these days. But there are more faithful ways to produce something for that wide an audience. Aside from the glaring exegetical and theological errors, it just seems perverse to ignore the hefty voices of traditional formulations in defining marriage, and, compounding that, a real shame to pluck out some naff buzzwords to stand in for them.