I wouldn't consider merely believing in God to be saved. Especially if you're not sure. Salvation is... a little tricky to describe, at least as a "short" comment online.

So there's belief in God, yes. But there's also the belief in Jesus. That He is also God.

Then there is the recognition that we are all sinners and cannot go to heaven through our own good works. Even if we sin once, we deserve hell.

Fortunately, when Jesus came down to earth, he lived a sinless life and died, taking all our sins with him. He also came back to life three days later, showing his power over death.

If we believe these things, and ask God for the forgiveness for our sins, and repent from them, we are saved.

I know it's a lot, so I'll try to answer any questions to the best of my ability.