The obedience necessary for our Salvation is what Jesus accomplished on the Cross.
This is why Jesus tells us that : "I am the way and no person comes to the Father (born again) but by me". John 14:6
On the Cross, the Lord said, just before He died...."It is Finished/Accomplished"
What is that?
That is "The GIFT of Salvation", as Jesus was about to die to make it available to you, as : John 3:16,17
If Jesus not die on the cross we not save no matter what
But salvation is only a viable for those who believe on Him, believe His teaching, not only believe Jesus is God but also believe His teaching
I am sure devil believe Jesus is God more than us, He saw Jesus on the cross we not, devil saw Jesus risen from the death, we not what devil lack is he not agree with His teaching, we do
What is His main teaching
Matt 22
37 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
38 This is the first and great commandment.
39 And the second is like unto it, Thou shalt love thy neighbour as thyself.
40 On these two commandments hang all the law and the prophets.
All the law of Jesus is love God and fellow man
Devil Only believe Jesus is God but hate Jesus and fellow man
If we do like devil believe Jesus as god but hate god and fellow man, than we not save