The Gospel verses that you quote relate to sexual relationships between men and women and not between members of the same sex, so they are irrelevant.
Revelation is not part of the Gospels and the author of Revelation 21:8 did not define sexual immorality, and if he did would probably have suffered from the same problem that Paul suffered from: ignorance of his time.
Otherwise, the "good news" of Revelation 21:8 is what some dude said that your God has promised those who dare to question what others had written about your God even though your God is supposed to love us.
