Not two gospels. One gospel with different dispensation just as Paul taught.
Ephesians 3:1 For this cause I Paul, the prisoner of Jesus Christ for you Gentiles, 2 If ye have heard of the dispensation of the grace of God which is given me to you-ward:
God through the prophet Daniel allotted 490 years to Israel as a chosen nation. There are still 7 years of that time left having been interrupted by Israels rejection of Jesus as the Messiah at which time God opened the plan of salvation to the Gentiles. When that time comes to an end as Paul says God will resume His dealing with Israel for that last seven years which will be the tribulation period.
Romans 11:25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.
>>If so, did you receive this teaching from a particular denomination/sect or come up with it independently ?<<
It comes directly from scripture. Adhering to any denomination teachings in whole is a very dangerous thing. Every one of them as far as I have been able to ascertain have strayed from scripture in one area or another.
>>How much of the book of Revelation, I wonder, are you saying does not apply ?<<
The entire book of Revelation applies.
Catholics and others who adhere to the belief that the church has superseded the nation of Israel in Gods plan will never be able to understand much of scripture and surely not much at all of prophecy.
BTW Adding those passages may have made you feel good but dont do anything to either support your position or add to the understanding of the subject you asked about.
That sounds alot like different gospels, one for the "church age" and one for "the tribulation." Do you consider the first the "Once Saved Always Saved" version and the second the "You Can Lose Your Salvation" or "Works" version ?