Lets be frank about what the implication of your position truly is, which I believe is wrong and disgusting.
Here is the scripture again:
Revelation 3:3
Remember therefore how
you have received and heard; hold fast and repent. Therefore if
you will not watch,
I will come upon you as a thief, and
you will not know what hour
I will come upon you.
The repeated YOU in this passage NEVER
EVER EXCLUDES the first century people at Sardis as you would have it. Not even once, ever.
Jesus plainly told THEM back THEN that His theif's coing would indeed
befall THEM... not might, not possibly, not maybe, not perpahs, not just a chance.... no, He told THEM:
"I
WILL COME UPON YOU AS A THEIF.
You say "He didn't Come upon them" In direct contrast, Jesus said TO THEM:
"I will Come upon you"
It is wrong and disgusting to Calim Jesus failed to make Good on His promise
to them, and renders the foundation fo our faith crumbled under the weight of the failure you propose, that your position mandates.
We are clearly told in the NT when Jesus comes upon one like a thief. It always involves His 2nd coming. That passage has to be understood in light of that unless you can provide a passage or two where He comes as a thief, but that it doesn't involve His 2nd coming in the end of this age, and that you can prove it from the text.
The following are basically most of the passages involving Him coming in that manner. Not to those watching, but those not watching.
Matthew 24:43 But know this, that if the goodman of the house had known in what
watch the
thief would come, he would have
watched, and would not have suffered his house to be broken up
Luke 12:39 And this know, that if the goodman of the house had known what hour the
thief would come, he would have
watched, and not have suffered his house to be broken through.
1 Thessalonians 5:2 For yourselves know perfectly that the day of the Lord so cometh as a
thief in the night.
1 Thessalonians 5:6 Therefore let us not sleep, as do others; but let us
watch and be sober.
1 Thessalonians 5:4 But ye, brethren, are not in darkness, that that day should overtake you as a
thief.
Revelation 16:15 Behold, I come as a
thief. Blessed is he that
watcheth, and keepeth his garments, lest he walk naked, and they see his shame.
Revelation 3:3 Remember therefore how thou hast received and heard, and hold fast, and repent. If therefore thou shalt not
watch, I will come on thee as a
thief, and thou shalt not know what hour I will come upon thee.
And take note what they all have in common, that which I underlined. You are not even making an attempt to interpret Scripture with Scripture here. You are interpreting Revelation 3:3 in a vacuum instead.