This is a lovely verse. Salvation doesn't just mean salvation. It also means "deliverance, help, victory, prosperity, rescue from distress or danger."
God won't leave us hanging. Promise! God has a plan always. God is closer to you than your own breathe. He just wants us to believe, really believe.
If we decide to believe no matter what, we are saying yes to Him and His ways. It can be scary but it is worth it. It takes a lot of courage and a little bit of "I don't care if people think I'm looney" attitude to believe in God wholly.
There aren't many who do. Often, a Believer has no problem believing in some areas but just can't in other areas. Those areas are the ones that need a lot of healing and changing. Those areas are the exact ones God wants to change. Often, only you and God know about the hold your flesh has on these areas. It is hard to let go.
I don't know if I am making sense (writing this at 5:30 a.m. and thinking as I write -- not always a good thing). Let's say you have struggled with finances your whole life. You give. You are responsible. You know God will provide. Yet you worry. If there is worry you aren't believing.
The presence of worry means there is also unbelief.
Worry isn't responsible. Worry is a sin.
God has a better way, a higher way, a way that will free you from worry!
Ask Him . . .