How/Why to be moral without believing God or any supernatural entity?

Being believer or **dependent on God** so far in my life, I'm clueless how exactly can I become independent without turning morally Bankrupt? Being devotee I'm automatically moral & lovingly but When I start believing in experience I become somewhat immoral, without any good feelings. **How & Why** to be moral without believing in supernatural entity like God? What are the ways to become independent because I want to be moral without being devotee or dependency on the God?