Hi,
Yes, important point. There are plenty of heretical groups that go off on huge red herring over a single verse.
Take this one for example
1 Corinthians 15:29 (New International Version)
29 Now if there is no resurrection, what will those do who are baptized for the dead? If the dead are not raised at all, why are people baptized for them?
Mormons think that they can baptise on behalf of the dead, even though over this single verse.
Now back the the "FDS", if you read the passage it is clear it is not talking about an organisation or even a single person.
Matthew 24:36-51 (English Standard Version)
No One Knows That Day and Hour
36 "But concerning that day and hour no one knows, not even the angels of heaven, nor the Son, but the Father only. 37 For as were the days of Noah, so will be the coming of the Son of Man. 38 For as in those days before the flood they were eating and drinking, marrying and giving in marriage, until the day when Noah entered the ark, 39 and they were unaware until the flood came and swept them all away, so will be the coming of the Son of Man. 40 Then two men will be in the field; one will be taken and one left. 41 Two women will be grinding at the mill; one will be taken and one left. 42 Therefore, stay awake, for you do not know on what day your Lord is coming. 43 But know this, that if the master of the house had known in what part of the night the thief was coming, he would have stayed awake and would not have let his house be broken into. 44 Therefore you also must be ready, for the Son of Man is coming at an hour you do not expect.
45 "Who then is the faithful and wise servant, whom his master has set over his household, to give them their food at the proper time? 46 Blessed is that servant whom his master will find so doing when he comes. 47 Truly, I say to you, he will set him over all his possessions. 48 But if that wicked servant says to himself, 'My master is delayed,' 49 and begins to beat his fellow servants and eats and drinks with drunkards, 50 the master of that servant will come on a day when he does not expect him and at an hour he does not know 51 and will cut him in pieces and put him with the hypocrites. In that place there will be weeping and gnashing of teeth.
The faithful and wise servant is anyone who continues being responsible over the affairs of the Master.
If you read the next chapter, there is clearly more that one faithful servant Matthew 25
Anyhow, don't beat yourself up, many others have been tricked and bewitched by the WT. Just make sure you stop serving this false master ASAP.
Blessings,
Stephen