I believe the creeds are valuable only insofar as their consistency with Scripture.
If the church established by Christ was even more altered and even warped then, and its true form and doctrine was lost, don't you think it necessary that it later be restored?
The Church Militant has always existed, not as an institution manipulated by governments, or as a branch of government, but as a body of believers indwelt by the Holy Spirit.
"If the church established by Christ was even more altered and even warped then, and its true form and doctrine was lost, don't you think it necessary that it later be restored?" Because Mormons do not comprehend the Church, they will swallow the lie that "... the church established by Christ was even more altered and even warped then, and its true form and doctrine was lost ..." and will follow after false gods of a demon inspired man's devising, Joseph Smith.
When Jesus promised to 'send another' to them, He was promising the Holy Spirit, HIS Holy Spirit would come unto them, and that not just the Apostles, but any who will believe they need salvation in Christ as He purchased for them on the cross and rose again to verify THAT COVENANT of His indwelling presence established by HIS PERFECT BLOOD.
Mormons adhere to a lie that THE Holy Spirit was lost to humankind after the last Apostle who saw Jesus in person died. They have chosen to believe this lie (they have exercised their free will to believe this lie) and in so doing have closed the door to their spirit so the very Holy Spirit they have been lied to about can not indwell them. They insist upon our being deceived by looking upon their good works. when one offers the good works of Buddhists and Ba'hais, Mormons pooh pooh this.
The entire of Mormonism rests upon the lie that God's Holy Spirit was no longer indwelling humankind once the last Apostle died, and God needed a Joseph Smith to restore the Holy Spirit to the human spirit. Islam began under similar libelous assertions by another demon inspired 'man of the flesh', albeit that demon inspired false religion sees suicide murder as 'good works'. If the flase teaching of Mormonism causes men's souls to perish eternally, is it not just as deadly, spiritually, as Islam?