Repent or Perish

And that's your...loving god?

John 3 BLB
16For God so loved the world that He gave the only begotten Son, so that everyone believing in Him should not perish, but should have eternal life. 17For God did not send His Son into the world that He might judge the world, but that the world might be saved through Him. 18The one believing in Him is not judged, but the one not believing already has been judged, because he has not believed in the name of the only begotten Son of God.
And read Romans 5:6-11

So he'll destroy you and damn you to an eternity of fire and brimstone if you don't obey him...but he loves us?

That's the dictionary definition of an abusive relationship. I know it can be hard to get out of those, hopefully you find the strength to rid yourself of someone who actively wants to destroy you

You get to choose if you want to have a relationship with God. He lets you make that choice.
Good News Translation
"I am now giving you the choice between life and death, between God's blessing and God's curse, and I call heaven and earth to witness the choice you make. Choose life." (Deuteronomy 30:19)

Good to know that my little sister, who is mentally disabled and not capable of making that choice, is doomed to spend an eternity engulfed if hellfire because she can't feed your gods ego.

Leaving an abusive relationship isn't easy, but it is possible. I hope you find a god who is less of a sociopathic narcissist.

Your little sister is covered by the blood of Christ. It's people who are capable of choosing who will be judged. Your problem may be one of ignorance; as to the nature of God and of His Word.
If you need help in finding sources that can help you with that, let me know, and I'll help you.