When newcomers arrive at a megachurch these days, they face an obstacle course of challenges -- from deciding how much to tip the parking-lot guy to tricking their normal children into looking like cherubs.

Finally, loaded with visitor swag -- donuts, coffee, official church water bottles, snappy Christian t-shirts, the pastor's new book -- they head into the flashing lights, dry-ice fog and pounding pop music inside the auditorium.

Now what? The bottom line: Look spiritual.

"On the powerful choruses, lift your hands high with abandon. On the subtler verses, tone it down a touch," advises the snarky narrator in the new book "How to Be a Perfect Christian," by the duo behind The Babylon Bee, a Christian satire website.

After the guitar solo, there will be a "bridge" that worshippers sing over and over and over: "Go for it with both hands and a feigned expression of emotion on your face. Sway side to side like a tree in the wind. If you open one eye at this point, you'll probably notice that people … are staring at you in awe that they're in the presence of one so holy."

The book's goal isn't to mock Christianity, but to help believers understand that many churches have evolved into self-help supermarkets defined by trends in mass culture, said Bee founder Adam Ford. Often, faith turns into another "niche" product.

"We push back against the commercialization and 'celebritization' of so many aspects of the church," noted Ford, who does email interviews since he struggles with anxiety attacks. "Get a famous pastor with a lot of Twitter followers, host the most carnival-like 'church services,' make sure everyone is as comfortable and entertained as possible, preach a Zig Ziglar-style message, and you'll get more people to come to your church. Like churches are circus franchises or something, with the ultimate goal being more butts in seats."

Ford wanted to become a pastor, but veered into the more private world of digital publishing (Adam4d.com). He founded the Bee in 2016 and recently sold the site, in part because of the hot spotlight caused by its success and a run-in with Facebook over content.