The Buddha and the Siddha

There are two Paths. The Lokuttara Path is the path that takes you out of the conditional cosmos altogether. Jainism, Buddhism, and various other traditions were founded upon the Lokuttara Path, even if most of the members of those traditions do not actually aim for transcending the conditional cosmos altogether. Zoroastrianism, Judaism, Christianity, Islam, Sikhism and various other traditions were founded upon the Lokiya Path, the path that aims for the fulfillment of the conditional cosmos, even if some of the members of those traditions may actually aim for the transcendence of the conditional cosmos altogether.

The Lokuttara Path may be called the Path of the Buddha, the Buddha being one who has 'awakened' to the transcendent realm.

The Lokiya Path may be called the Path of the Siddha, the Siddha being one who has 'accomplished' the fulfillment of the conditional realm.

In that sense, Jesus of Nazareth was a Siddha, and Christianity is a Siddhic tradition.

Another name for Siddha is Tantrik.