The biblical gospel consist of what is nowadays called calvinism, its the word of God. Listen to the Baptist Charles Spurgeon
I have read Spurgeon but I do not use him to tell me what the gospel message is.
This is the gospel message.
1Co 15:1 Now I make known to you, brethren, the gospel which I preached to you, which also you received, in which also you stand,
1Co 15:2 by which also you are saved, if you hold fast the word which I preached to you, unless you believed in vain.
1Co 15:3 For I delivered to you as of first importance what I also received, that Christ died for our sins according to the Scriptures,
1Co 15:4 and that He was buried, and that He was raised on the third day according to the Scriptures,
The TULIP/DoG is not the gospel message.
All you have done is show that you trust man over the word of God.