Unbelief is like gravity, it's always pulling down on the authority of Scripture.

The truly changed, truly converted, truly Christian heart can say with John Newton, “I am not what I ought to be. I am not what I wish to be. I am not what I hope to be. Yet I can truly say, I am not what I once was. By the grace of God, I am what I am.

Actually, having a few questions of your own shouldn't prevent you from sharing the gospel with others. You can explain to them that while you still have a few unresolved questions yourself, you don't have enough faith to not believe.

We are all called to initiate involvement in each other’s lives... We covenant together to work and pray for unity, to walk together in love, to exercise care and watchfulness over each other, to faithfully admonish and entreat one another as occasion may require, to assemble together, to pray for each other, to rejoice and to bear with each other, and to pray for God’s help in all this.

We are called to love others. We share the gospel because we love people. And we don't share the gospel because we don't love people. Instead, we wrongly fear them. We don't want to cause awkwardness. We want their respect, and after all, we figure, if we try to share the gospel with them, we'll look foolish! And so we are quiet. We protect our pride at the cost of their souls. In the name of not wanting to look weird, we are content to be complicit in their being lost.

All evangelists want to do is share a message about the forgiveness of sins and reconciliation with God. But our world is confused by the confidence we have in the gospel, and is threatened by it. Satan, I am sure, causes those things to echo in the world to increase this sort of common confusion.

I think we have to realize that God sometimes gives us more time to pray, and when he does this, we can pray that he will bless those who have opportunities to speak to others.