Esoteric Christianity alive and...well, alive (but quitely)
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Esoteric Christianity can be found practiced by individuals or small groups today, as has been the case thru history. It is the Christianity practiced by the Pneumatics (spiritually minded people), as opposed to the Somatics (body oriented, or earthly minded people–to use Origen's terminologies). This distinction has always existed, and always will exist. For its historical antecedents, read about the Originist controversies.
In more recent times, even the first Lutherans had an esoteric bent–the rosy cross was there symbol. The Ephrata community in Pennsylvania in colonial times in America had an openly esoteric side. Beginning in the early 20th century, the Liberal Catholic Church began as a sacramental church with decidely esoteric teachings. These are just a few examples of the known groups, and many there are that were and are hidden.
The flavors of esotericism range from the original inner, mystical traditions of Christ and the Apostles, to sycretic creations of those dissatisfied with the modern ignorance which has been grafted on the body of Christianity thru the centuries.
I can point you to some articles which speak of the former, which I believe you may find interesting and informative:
General Articles on Esoteric Christianity
May a Christian believe in Reincarnation?
I Believe: The Faith of a Gnostic Christian
(links below)
http://www.atmajyoti.org/spirwrit-christianity.asp]
http://www.atmajyoti.org/sw_xtian_believe_reinc.asp]
http://www.atmajyoti.org/sw_i_believe.asp