Upvote:1
thank you for your questions. Yes, God is wonderfully merciful, loving, and generous. He is hurting a lot when his children go astray and hurt themselves, because He wants his children to be happy, but to be happy they have to return to him. So God sends a rescue mission in the person of Jesus, his only Son.
I'll try to answer your questions now.
Why does God love the world so much? Or the individual people in it?
The world in John 3:16 means all the people He had created, so yes, all the individuals. The "world" here doesn't mean earth, although God also loves nature as well (because he creates the universe too !) and at the end of time God will recreate earth to be better than ever !
Why does God love the world? Same reason why parents love their children: they brought the children into the world and they want the children to have the best lives they can have.
Does this mean we only have to believe in Jesus Christ/God to go to heaven?
The short answer is YES. But what does believing in Jesus mean?
Let's say the their child breaks a law (shoplifting, steal car, hurt another child, etc), then parents would have to pay for the damage so the child can come home from the police station. Of course it costs the parents money and shame, but they want to give the child a new start. But what does the child need to do? If the child still wants to join gangs and doesn't want to come home, what can the parent do? So believing in Jesus means you have to stop the rebellion and start trusting your parents again and SHOW the trust by obeying their commandments so you can grow to be the best adult you can be. You don't have to repay your parents the cost of your upbringing or the damage you have caused, you only have to trust your parents. It's FREE ! That's what believing in Jesus means.
I hope I answered your questions. Please ask questions in the comments section.
God bless !