Tales of the Buddha

Various stories about "the Buddha" date to at least the sixth century BCE, and the sculptures provided by Lockwood represent scenes from his alleged life that are often based on texts dating to early Christian or pre-Christian times. Hence, it is impossible or unlikely for these Buddhist stories to have been copied from Christianity.

For example, the relief from Borobudur of the "Bodhisattva's first day of school" (Lockwood, 33) dates from the eighth century AD/CE; yet, the text in which this story appears, the Lalitavistara Sutra, dates to the third century AD/CE at the latest.

Source: Buddhism's Relation to Christianity