Justifying the Four Noble Truths without rebirth

"So, based on this, how do Secular Buddhists justify their acceptance of the Four Noble Truths and the Buddha's teachings in general, if they reject rebirth? How would the Four Noble Truths and Nibbana have any meaning or usefulness for them? Why would they choose to follow the Noble Eightfold Path, if death is a much simpler way to end suffering?"

You should give this question to the author of the article.

From the article it seems like the author has the belief that rebirth does not exist because there is no evidence for it. If he has such a belief, then his belief is no different than the belief that rebirth exists. In fact, both beliefs are mostly based on "lack of evidence":

The author, due to lack of evidence, believes "there is no rebirth". The religious, due to lack of evidence, believes "there is rebirth". Both are believers. Thus, both have their own religions.

Not only that I don't have a belief in rebirth, but I KNOW that rebirth is true. I was and I am a big skeptic and an agnostic (if I have no proof of something, I neither reject it nor accept it ... I leave it open, but need STRONG proof and evidence before I accept something as true). Nonetheless, regarding spirituality, I was more an atheist then an agnostic. I thought that spiritual and religious beliefs are all made up. I've never read any suttas, nor religious texts, nor books about spirituality, nothing. Never been in the church, nor practiced any religion or spiritual belief nor knew much about them. I was a total skeptic, almost atheist, and gave ZERO attention to spirituality, past lives, God, and similar. During the period when I meditated, I refrained from reading any suttas, religious texts, books about spirituality and similar. I didn't want it to somehow influence my findings and most importantly, if I knew or read about the teachings of the Buddha and similar before attaining my own realizations, how would I know that what I've realized was not just my own imagination under the influence of some teaching, belief, idea, that I've read in some sutta or book about spirituality or religion?? That's why I refrained from reading anything at all. It was only when I got answers to all my questions, that I started to read about God and compared my realizations to what was written in the old texts. I read the Bible and it all made perfect sense to me, but I couldn't 100 % accurately connect it with my own realizations because the texts contained symbolic words and/or stories (example is God which I understood as nonself; heaven which I understood as Nibanna; Satan which I understood as self; hell which I understood as lower realms; "Believe in God and he'll forgive you all your sins" which I understood as "realize nonself and you'll be free from suffering"; the story of Adam and Eve which I understood as volitional activities and thus the birth of self; and similar). It was only when I found Buddhist suttas that everything was written exactly as it is ... no symbolic words nor symbolic stories ... just pure truth. You just can't come closer to the truth in writing.

My message to you is don't accept nor reject anything.

Find a way to TOTALLY calm your mind and observe. Then ask yourself questions. Who am I? How my mind works? Why do I hear sounds through my ears? Is it sound or is it just sound waves vibrating my ear membrane giving raise to sensation in my mind/body, giving raise to thoughts that sound like sound? Why does a thought arise? What's its cause? What is pain? Why does it arise? What is memory? What is remembering? What is time? Just ask questions. Do tests. Do experiments. Be curious. All the answers are in meditation.

1. Anti-rebirthist = ucchedadiṭṭhi = one extreme.
2. Rebirth-lover = sassatadiṭṭhi = another extreme.
3. Profit-follower = eightfold path = middle way.

1st and 2nd see brahmajālasutta.

3rd see dhammacakkappavaḍḍhanasutta. (I am in plan to re-translate this sutta, but I can't not done it now. So if something wrong, I am sorry. I can't not check it deeply now, because my english still not good enough.)

"There are these two extremes that are not to be indulged in by one who has gone forth. Which two? That which is devoted to sensual pleasure with reference to sensual objects: base, vulgar, common, ignoble, unprofitable; and that which is devoted to self-affliction: painful, ignoble, unprofitable. Avoiding both of these extremes, the middle way realized by the Tathagata — producing vision, producing knowledge — leads to calm, to direct knowledge, to self-awakening, to Unbinding.

"And what is the middle way realized by the Tathagata that — producing vision, producing knowledge — leads to calm, to direct knowledge, to self-awakening, to Unbinding? Precisely this Noble Eightfold Path: right view, right contemplate, right speech, right action, right livelihood, right effort, right mindfulness, right concentration. This is the middle way realized by the Tathagata that — producing vision, producing knowledge — leads to calm, to direct knowledge, to self-awakening, to Unbinding.

What is profit?

6 profit: self profit, the others' profit, public's profit (common interest), this life's profit, next life's profit, and nibbāna-profit. (pali for search: attattha, parattha, attaparattha, ditthadhammika, samparāyika, and paramattha.)

Self profit, the others' profit, and public's profit (common interest) are done together by sati.

"Because of what I have said here, monks, you should train yourselves such that the gifts of those whose requisites we use — the robes, alms-bowl, chair, bed, and medicine as a support when sick — will have great fruits, great merits [for the people who give them], and our going forth will not be in vain, will be fruitful, will have a result. Thus should you train yourselves, thoroughly seeing that for your own benefit, monks, it is right to strive with heedfulness; thoroughly seeing that for the benefit of others, monks, it is right to strive with heedfulness; and thoroughly seeing that for the benefit of both, monks, it is right to strive with heedfulness."

This life's profit and next life's profit are done together by sati (appamāda). So, person who do just this life's profit or next life profit is pamāda person. see:

http://www.accesstoinsight.org/tipitaka/sn/sn03/sn03.017.than.html

Nibbāna profit can be accessed by practitioner after he perfect finished to meditate magga. And that magga can start to meditate after sīla is done.

SN 45.149 Just as, bhikkhus, whatever actions are to be performed with strength are all performed on dependence on the earth, supported by the earth; in the same way, bhikkhus, it is on dependence on virtue, supported by virtue, that a bhikkhu develops the noble eightfold path (magga), that he cultivates the noble eightfold path.

Above sīla give this life's profit and next life. See (1st-4th are this life's profit, 5th is next life's profit):

Mahāparinibbānasutta 24. "Five blessings, householders, accrue to the righteous man through his practice of virtue: great increase of wealth through his diligence; a favorable reputation; a confident deportment, without timidity, in every society, be it that of nobles, brahmans, householders, or ascetics; a serene death; and, at the breaking up of the body after death, rebirth in a happy state, in a heavenly world."

So, anti-rebirthist & rebirth-lover are pamādo (person who has not meditating mindfulness).

That is one of many reasons that why I, who have never seen any ghost or any spirit, am not deny next life.