Another belief he shares with Sufism is the idea that God, humanity and the natural world are all linked, and might even be part of a single entity, a sort of cosmic trinity.

Sounds like panentheism, a form of pantheism, an ancient belief system.

Who today represents a Christian counterpart?

There can not be a Christian counterpart to panentheism, it is fundamentally contradictory to the later. Christians believe humanity and nature are linked to God because they are created by Him. Christian belief hold that God is also the sustainer of the universe and not only transcendent but also immanent.

For example, it suggests that a believer will love and r...

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Another belief he shares with Sufism is the idea that God, humanity and the natural world are all linked, and might even be part of a single entity, a sort of cosmic trinity.

Sounds like panentheism, a form of pantheism, an ancient belief system.

Who today represents a Christian counterpart?

There can not be a Christian counterpart to panentheism, it is fundamentally contradictory to the later. Christians believe humanity and nature are linked to God because they are created by Him. Christian belief hold that God is also the sustainer of the universe and not only transcendent but also immanent.

For example, it suggests that a believer will love and respect humanity and the natural world as they would God. It also means that no one should be seen as an outsider.

We can see an example of this in Christianity by a few witnesses, for example that of St. Francis of Assisi. His simple yet profound prayer is a small example of his life who practiced what he preached:

http://www.franciscanfriarstor.com/stfrancis/stf_canticle_of_the_sun.htm

The least among the servants of God:

http://www.stfrancisepiscopalchurch.org/Goodies/Patron.html