Hello everyone Ignacio here:
I personally believe Jehovah Witnesses and Mormons are not a threat to Christianity.
I believe a bigger threat would be: Islam, Atheism, Paganism, and Wicca.
I believe Jehovah Witnesses and Mormons hold common truths to Catholics and Christians.
Have Blessed Day
I respectfully disagree. The greatest threat to salvation is false doctrine that pretends to be "Christian" and claims they receive it from the "Spirit of God," even from those within the Church, and so they deceive even Christians into turning aside from the sound doctrine of the Lord Jesus and the Apostles.
1 Corinthians 4:6 (WEB) Now, brothers and sisters, I have applied these things to myself and Apollos for your benefit, so that you may learn from us the meaning of the saying, “
Do not go beyond what is written.” Then you will not be puffed up in being a follower of one of us over against the other.
2 Corinthians 11:3-4 (WEB) 3 But I am afraid that somehow, as the serpent deceived Eve in his craftiness, so your minds might be corrupted from the simplicity that is in Christ. 4 For if he who comes preaches another Jesus, whom we didn’t preach, or if you receive a different spirit, which you didn’t receive, or a different “gospel”, which you didn’t accept,
you put up with that well enough.
Acts 20:29-33 (WEB) 29 For I know that after my departure, vicious wolves will enter in among you, not sparing the flock. 30 Men will
arise from among your own selves, speaking perverse things, to
draw away the disciples after them. 31 Therefore watch, remembering that for a period of three years I didn’t cease to admonish everyone night and day with tears. 32 Now, brothers, I entrust you to God and to
the word of his grace, which is able to build up, and to give you the inheritance among all those who are sanctified.
1 Timothy 4:16 (KJV) Take heed unto thyself, and unto the
doctrine;
continue in them: for in doing this thou shalt both
save thyself, and them that hear thee.
1 Timothy 6:20-21 (WEB) 20 Timothy, guard that which is committed to you, turning away from the empty chatter and oppositions of what is falsely called knowledge, 21 which some profess, and thus have
wandered from the faith.
2 Timothy 2:16-18 (WEB) 16 But shun empty chatter, for it will go further in ungodliness, 17 and those words will consume like gangrene, of whom is Hymenaeus and Philetus: 18 men who have erred concerning the truth, saying that the resurrection is already past, and
overthrowing the faith of some.
2 Timothy 2:25-26 (WEB) 25 in gentleness correcting those who oppose him: perhaps God may give them repentance leading to a full knowledge of the truth, 26 and they may
recover themselves out of the devil’s snare, having been taken captive by him to his will.
2 Timothy 3:4-5 (WEB) 3 For the time will come when they
will not listen to the sound doctrine, but having itching ears, will heap up for themselves teachers after their own lusts, 4 and will turn away their ears from the truth, and turn away to fables.
The Jehovah's Witnesses teach a different "gospel." The Jehovah's Witness, except for the 144,000, are taught that:
*They are not in the New Covenant,
*The Bible was
not written for them,
*The Memorial Service (Lord's Supper) is only to be partaken of by the 144,000,
*That they do not have the Spirit of Christ,
*They do not belong to Christ.
For the average Jehovah's Witness, they are taught that: They can only be saved by the {{{"Anointed (
Christ) Class,"}}} represented by the
Governing Body, who will judge all people during the Millennial Kingdom, as either saved to live on Paradise Earth, or be condemned; therefore, the JW must obey everything the "Anointed (
Christ) Class" tells them to do and to believe if they want to be saved.
Matthew 24:5 (WEB) 5 For many will come in my name, saying, ‘
I am the Christ,’ and will lead many astray.
1 Corinthians 15:1-2 (KJV) Moreover, brethren, I declare unto you, which also ye have received, and wherein ye stand; 2 By which also ye are saved, [[ "IF" ]] ye keep in memory what I preached unto you, unless ye have
believed in vain.
2 Corinthians 11:13-14 (WEB) For such men are false apostles, deceitful workers, masquerading as Christ’s apostles. 14 And no wonder, for even Satan masquerades as an angel of light.
Galatians 1:8-9 (WEB) 8 But even though we, or an angel from heaven, should preach to you any “gospel” other than that which we preached to you, let him be cursed. 9 As we have said before, so I now say again: if any man preaches to you any “gospel” other than that which you received, let him be cursed.
1 John 1:24-25 (WEB) 24 Therefore, as for you, let that remain in you which you heard from the beginning. If that which you heard from the beginning remains in you, you also will remain in the Son, and in the Father. 25 This is The Promise which he promised us, the Eternal Life.
With over 8.7 million Jehovah's Witnesses, over 17 million Mormons, in the world, I would say that is a catastrophic threat to Christianity, in that, these persons are most likely not saved, since they are not in the Gospel of Christ Jesus. And what is especially threatening, is that Christians, like yourself, do not even realize the threat.
Having a good heart, and being well-meaning and sincere, will not save them on that day. Many Satanists, witches, etc, are well-meaning, sincere, and are of good heart to others, but they are in a false religion as well.