You should maybe tell Paul.
Ephesians 3:2 If ye have heard of the dispensation of the grace of God which is given me to you-ward:
Read Hebrews!
Paul stated that his gospel was the same gospel preached to the Israelites in the desert.
Hebrews 3:
[12] Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.
[13] But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin.
[14] For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end;
[15] While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation.
[16] For some, when they had heard, did provoke: howbeit not all that came out of Egypt by Moses.
[17] But with whom was he grieved forty years? was it not with them that had sinned, whose carcases fell in the wilderness?
[18] And to whom sware he that they should not enter into his rest, but to them that believed not?
[19] So we see that they could not enter in because of unbelief.
Hebrews 4:
[1] Let us therefore fear, lest, a promise being left us of entering into his rest, any of you should seem to come short of it.
[2] For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard it.
[3] For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world.