Difference between Soul and Atman or AATMA:
ATMAN IS NOT SOUL
In dharmic tradition, the true nature of self or Atman is sat-chit-ananda.
In Christianity, all humans are born as sinners due to original sin by adam & eve.
Hence the true self or Soul is sinful.
The true nature of Atman can be realised with sadhana or adhyatma vidya
Only through Jesus can the Soul attain salvation.
Atman is present in plants and animals.
Hence nature is as sacred as the self.
Soul is NOT PRESENT in plants and animal.
In Bible,(and in Quran) GOD gave mankind dominion over plants and animals.
Atman reincarnates. Hence the body is cremated once atman has departed.
Soul DOES NOT reincarnate.
Hence in Christianity you get only one body that must be preserved till the end