I'm quite confident that you would not consider their beliefs equal to your own. They would likely feel the same about yours.
In considering the key question "Who do you believe?" I provided a range of examples. They included the successful (Catholic, Orthodox, LDS) and the tragic (Applewhite's Heaven's Gate, Koresh's Branch Davidians and Jim Jones.)
As for me, again I testify that I love God, I believe Him and I trust Him. Him alone.
No mortal being - or collective of mortal beings - can thwart the will of God. Indeed, no thing at all can thwart the will of God.
Remember the former things of old: for I [am] God, and [there is] none else; [I am] God, and [there is] none like me, Declaring the end from the beginning, and from ancient times [the things] that are not [yet] done, saying, My counsel shall stand, and I will do all my pleasure: - Isaiah 46:9-10
Why do the heathen rage, and the people imagine a vain thing? The kings of the earth set themselves, and the rulers take counsel together, against the LORD, and against his anointed, [saying], Let us break their bands asunder, and cast away their cords from us. He that sitteth in the heavens shall laugh: the Lord shall have them in derision. Then shall he speak unto them in his wrath, and vex them in his sore displeasure. - Psalms 2:1-5
But Jesus beheld [them], and said unto them, With men this is impossible; but with God all things are possible. - Matthew 19:26
AMEN! AMEN! AMEN! AMEN! AMEN! AMEN! AMEN!
With all due respect ,Dear Sister, the protestant belief that their scripture interpretations are always guided by the Holy Spirit is the cause of these groups you mention.
Catholic/ Orthodox rely on over 2000 years of the teaching authority of the Church lived through the lives of the Apostles martyrs and saints