Do I have Joy? Yes I do. Although not all the time to be honest. But when I do, it is genuine and authentic. When I self-identified as a Christian I also had joy. But it was the joy of a drunken man. I've sobered up a bit since then.
The God-condoned slavery in the Bible is a big problem. Did you not read what it said in Exodus 21? I can't support that. Ever. So there is plenty of stuff holding me back. A long list. Though it looks like one has been eroded - an inconsistency about Judas' death.
Another thing occurred to me this morning. Why should I believe in a God who can't even get basic Astrophysics correct? Genesis says that plants were made on Day 3 and the Sun on Day 4, which is the wrong order. If a Biblical Day is not 24 hours and corresponds to a vast era of time, how were the plants photosynthesising?
You have several premises wrong here.
First, joy is NOT the same thing as happiness. What you describe is happiness by the very fact that it comes and goes. It is fleeting and momentary. JOY, is a permanent underlying wellness, that never leaves a Christian. Yes, Christians can be saddened, and even depressed, because we still inhabit a dead, and decaying body, in a dead and decaying world, but through the knowledge of the Lord, and the indwelling of the Holy Spirit, OUR spirits have a constant joy in anticipation of our resurrected King and new, sin free bodies.
Secondly, God did not create, nor endorse slavery. The Biblical "slavery" that God endures is far different than the type of slavery we think of today. It is far closer to call it indentured servitude, which in that economy benefited the servant, in a similar way that an employee benefits from an employer today.
God's greatest work is the redemption of mankind from his fall. That is why servitude, even forced servitude, and other human activities YOU deem immoral, can be used to bring others to Christ. Leading people to Him is THE Single, MOST IMPORTANT act a human being can do.
It's what EVERYONE here has been attempting to do with you.
WE, deem your blasphemy immoral, yet we endure it in the hopes that you too will be born again from above.