No. It is Hindu.
You are referring to the concept "paramatma" or "atman". Every thing that has a begining has an end. Everything ceases. There is nothing permenent, so there is nothing eternal. Buddhism disagrees on that there is something that goes out after death or comes in on birth. But there is reincarnation, until one attains Nirvana, the ceassion of re-incarnation. Buddhism teaches the way to attain this exactly.
Hinduism is a religion that based on the concept of God. But Buddhism is not based on this concept. According to them, gods are a kind of powerful aliens but not deathless. Buddhism was a philosophy based on the concept of cause and effect. Later, some followers of Buddhism converted it to a religion.
There is no offical god in Buddhism, but actually buddhism does have a dharmic god like equivalent, it is called Nirvania.This is the case because in hinduism and sikhism they both believe that god is a peaceful place, home to the soul(atman/jiva) and free of suffering, and buddhism believes in this but calls it Nirvania.
Yes, both Hinduism and Buddhism share the belief in reincarnation, but they approach it in slightly different ways. In Hinduism, reincarnation is part of a broader concept of the cycle of birth, death, and rebirth known as samsara. The soul, or atman, is reborn in a new body, and its actions (karma) in past lives influence the circumstances of its future lives. The ultimate goal in Hinduism is to break free from this cycle and achieve moksha, which is liberation from the cycle of rebirth. In Buddhism, the belief in reincarnation is a bit different. Buddhists don't believe in an eternal soul (atman), but they do believe in anatta (no-self), where a person’s consciousness or karma continues in the cycle of rebirth. However, in Buddhism, the ultimate goal is to achieve nirvana, which is the cessation of suffering and the end of the cycle of reincarnation altogether. So while both religions share the concept of reincarnation, the understanding of the soul and the ultimate goal differ significantly.
Buddhists and Hindus primarily disagree on the concept of the self and the nature of reality. While Hinduism posits the existence of an eternal soul (atman) that is ultimately unified with Brahman (the universal spirit), Buddhism rejects the notion of a permanent self, teaching instead the concept of anatta (non-self). Additionally, their views on the path to liberation differ, with Hindus often emphasizing devotion to deities and ritual practices, whereas Buddhism focuses on the Four Noble Truths and the Eightfold Path to achieve enlightenment.
Baptism is not part of Buddhism. This is a result of Buddhism not having a deity, the concept of anyone or thing being able to "purify" anyone else except that person themselves. Even the concept of "purification" is shakes Buddhism has no concept of sin, original sin, damnation, salvation etc.
The concept does not apply in Buddhism.
The Nichiren Shu are considered a part of traditional Buddhism. There is no concept of post-Buddhism religions as there is a concept of post-Islamic religions.
Buddhism concept is to tame our wild minds and make free from any suffering.- Yeshi
Buddhism is considered a heterodox school of Hinduism because it diverges significantly from key Hindu beliefs, particularly in its rejection of the authority of the Vedas, the caste system, and the concept of an eternal soul (Atman). Instead, Buddhism emphasizes the Four Noble Truths and the Eightfold Path as a means to attain enlightenment (Nirvana) and views suffering as a fundamental aspect of existence. While it originated in the same cultural and philosophical milieu as Hinduism, its core teachings and practices set it apart, leading to its classification as a separate tradition.
atman
No one knows, because you cannot see the Atman. The Atman is the observer which no one can observe. Therefore, it is impossible to answer your question.