That is easily proven. All one has to do is see from THE WORDS OF CHRIST that the Rapture is imminent. It could happen at any time with no connection to a Tribulation period or any other event. And the parable of the Ten Virgins is an outstanding example.
Then shall the kingdom of heaven be likened unto ten virgins, which took their lamps, and went forth to meet the bridegroom... Watch therefore, for ye know neither the day nor the hour wherein the Son of Man cometh.
This is corroborated several times:
Watch therefore: for ye know not what hour your Lord doth come. (Mt 24:42)
Therefore be ye also ready: for in such an hour as ye think not the Son of Man cometh. (Mt 24:44)
After a long time the lord of those servants cometh, and reckoneth with them. (Mt 25:19)
All this is addressed to believers (servants of Christ) -- the disciples -- and then to us. As we know from other Scriptures, this is NOT the Second Coming of Christ, which is to judge the world, when He comes with all His saints and angels.
Now that it has been proven, will you believe it or continue with your false doctrines?