I have probably studied Christianity as much or more than you have. I am also a student of other religions.
The fact is that they are giving similar messages, which boil down to: respect others and treat them the way you want to be treated. Treat others in a loving and kind manner. This is the message of all of these statements.
When you say that “The other religions do not teach such a powerful message”, it’s clear you simply don’t understand them. That is the common message here.
They are most definitely NOT the same message. The fact that you logically cannot distinguish the difference says something sad about your education. The Christian message is a message of action and positive behavior towards others. Other teachings merely say don’t hurt some one else....allowing for passive ignorance. God calls us all to more than that