I am not very familiar with the "New Age" philosophy. What can you tell me about it?
New Age are a group of spiritual and religious practices from the West which started around 1970.
What exactly is the philosophy of the New Age practice?
Typically it involves a designation of spirit, mind and body and how they relate to one another.
That sounds very interesting. What other practices do they involve in their philosophy?
One practice is tantra which means to loom and involves meditation and spiritual connection.
What exactly does "to loom" mean? Is that like an out of body experience?
Tantra, to loom can also mean weave, and system.
Typically, do those who practice New Age principles also believe in God or are they mostly atheist? 
Since new age applies to a range of religious beliefs and practices, some do and some do not I'm sure.