Your mother believes in true evil, or wrong, not true Buddhism. What she believes in is an ancient religious form based on Buddhism and combined with other beliefs. Its scripture is Maitreya Zun Jing, which was originally owned by my family. At that time, I was still young and didn't understand the real Buddhism. I once thought it was a real Buddhist sutra, but with the development of my thinking and the deepening of my study, I realized that it was a fake Buddhist sutra at that time, so I sent it to the temple and burned it.
Let's talk about historical reasons. Maitreya belief was as popular as Amitabha belief in the past and earlier than Amitabha belief, but it gradually declined and did not survive. The main reason is that some people misinterpret Maitreya's afterlife thought. Due to the misinterpretation of Maitreya's afterlife thought, it was used by a group of unscrupulous people, contaminated with political color from pure religious belief, leading to its decline. In ancient times, people who were generally dissatisfied with real politics used this as an excuse to spread rumors and created many political riots. There are many records in ancient books, so I won't elaborate here.
According to the true scriptures (the classics said by the real Buddha) such as "The Buddha said that Maitreya was born" and "The Buddha said that Maitreya was born", there were 576 million years before Maitreya became a Buddha (equivalent to the age when Maitreya lived for 4,000 years). At that time, it was 84,000 years old. The scripture says "5.67 billion years", which is a question of translation. "100 million" means translating "100 million" into "100 million". In ancient India, "100,000" and "million" were also called "100 million", so we must make it clear, otherwise it will be confused. After the death of Sakyamuni Buddha and before the appearance of Maitreya Buddha, who will mainly educate all beings during this time? It's a Tibetan bodhisattva. Note that it is the "Lord", that is, there is not only a Tibetan bodhisattva to educate, but also mainly him. According to the book The Wishing Sutra of Tibetan Bodhisattva, Sakyamuni Buddha entrusted the important task of educating all beings to Tibetan Bodhisattva. Another great bodhisattva closely related to Jambu-Di^pa sentient beings (simply understood as the earth) is Guanyin Bodhisattva. Sakyamuni Buddha, Avalokitesvara Bodhisattva and Earth Treasure Bodhisattva are collectively called the "Three Saints of Nuwa". Mother-in-law's world can be simply understood as the Milky Way. In addition, there are manjusri bodhisattva, samantabhadra bodhisattva and many other great bodhisattvas. Maitreya is not the only Buddha. Maitreya has not yet become a Buddha, nor is it a world Buddhist leader.
As for the statement that "the ancient Buddha who lights a lamp is the leader of Ziyang robbery, the Buddha of Sakyamuni is the leader of Hongyang robbery, and the Buddha of Maitreya is the leader of Baiyang robbery", it is obviously formed under the guise of the belief of "Lifo III" and is fabricated.
In fact, the "vertical three buddhas" should be three buddhas close to becoming buddhas, namely Kaya Buddha, Sakyamuni Buddha and Maitreya Buddha. Burning Buddha is far away from Sakyamuni Buddha, separated by many buddhas, while Sakyamuni Buddha and Maitreya Buddha are very close. Therefore, it is not accurate to call burning Buddha, Sakyamuni Buddha and Maitreya Buddha "vertical three buddhas". (say a few digressions. )
How to tell true from false? I have a simple method: anything with Taoist or China traditional figures such as "Lao Jun", "Yuan Shi (Buddha)", "Jade Emperor" and "Yao Chi Jin Niang" is basically problematic. Anything that does not conform to the "Tao" written in Buddhist scriptures is basically "heterodox" (bad or evil) or "heresy" (different from heterodox, without derogatory meaning). Among them, the other apocrypha I know about Maitreya Bodhisattva is Confessions of Maitreya, but its harm is far less than Maitreya Zun. If you have any apocrypha at home, send it to the temple and burn it at once. If there is no temple, burn it in front of your own Buddhist temple, repent of your past mistakes and ask Buddha and Bodhisattva to put it on.
Many ancient and modern monks and great virtues vowed to go to the pure land of Maitreya (leading to the inner courtyard of the nursery school). For example, in the Han Dynasty, there were Dao 'an masters in the Sixteen Countries of the Eastern Jin Dynasty, Xuanzang masters in the Tang Dynasty, Xuanzang's first disciple in the Tang Dynasty, a great poet in the Tang Dynasty, and Master Xu Yun and Master Taixu in modern times. In Tibet, the pioneers in the later period of Tibetan Buddhism were the venerable Adi Gorge in ancient India, Zong Kaba, who was known as the "Second Buddha" with Manjusri Bodhisattva as the main incarnation, and many eminent monks and great virtues who practiced Tibetan Buddhism. You can slowly help your mother turn to such a true belief and let her learn from those masters instead of listening to the left-hand side.
As for how to correct mom's mistakes, you need patience and take your time. Take him to the temple and ask a mage who really understands Buddhism to enlighten him, or find more enlightenment and articles about this from a monk and a great virtue for her, or
If you can communicate or ask questions with monks online, you can seek advice from monks online, such as the website of Master Kong Jing and so on. As long as you put your heart into it, you can get the result. As for your mother, "temples become tourist attractions, which is not the right way." This is wrong, temples have indeed become tourist attractions, but it is wrong to say that it is not right, which has created a very heavy industry! In the last days of Buddhism, it is convenient for Buddhism to attract all beings, and modern technology is developed. Otherwise, fewer people will know about Buddhism. Although this can't help people get rid of it in a short time, it can be a cause of Bodhi, which will surely be deeply rooted in people's hearts and become a Buddha sooner or later.
The above is my personal opinion. Please be good at thinking and choosing the specific content.