Hi JT1! Nice to "meet" you.
The true Church believes the true Gospel:
"Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;
By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
For I delivered unto you first of all that which I also received, how that Christ died DIED FOR OUR SINS according to the scriptures;
And that he was buried, and that HE ROSE AGAIN the third day according to the scriptures..." I Corinthians 15:1-4
The true Church declares it with their mouths as well:
"That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation." Romans 10:9-10
The true Church believes that Jesus Christ is truly God:
"In the beginning was the Word, and the Word was with God, and the Word was God." John 1:1
"And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory." I Timothy 3:16
There are more Scriptures of course, but so far... the Mormons and the Jehovah's Witnesses wouldn't pass these tests.
Be well,
Doug