Ivan: I want to go to a good university,to marry a wife who loves me and I
her, and to get a good job.
Those are excellent goals. You should pursue what you want and live your own life.
Ivan: I can't do that because this is the opposite
of a "happy life" as described by the Great 7.
Sure you can. The only thing stopping you is fear. "The Great 7" as you call them, are not going to take care of you. They're too busy fleecing the flock. Have you noticed not one of them has a real job or earns a living? (Acts 18:3). They are parasites sponging off of their deluded followers. Don't be one of them.
Ivan: What should I do to make
sure our parents love and treat us as their children, regardless of our
religious beliefs.
There is nothing you can do to make anyone love you. You would think that the natural love and affection (2 Timothy 3:3) a parent should have for their own children would be stronger than any dubious religious beliefs, but this cult (as well as countless others) have proven time and again that this is sadly not true.
Ivan: Should we try to convince them of TTATT?
No you should not. No one will "wake up" unless and until they are ready.
Ivan: We don't
want to have parents who disown us because we live our lives the way we
feel the most comfortable.
Of course you don't. But you should still live your own life. It's the only one you will every have. Ultimately, the most important relationship we have in this life is the one we have with our self. - (Attribution redacted)