We must battle unbelief - and battling unbelief is a community project. We are commanded to be watchful against an evil, unbelieving heart that is hardened. We are commanded to exhort each other - corporately - regularly - urgently - and redemptively. We have been given an example of a hard hearted generation and how that generation died in the wilderness after leaving Egypt with Moses because they would not believe God.
But, we will never fight unbelief until we fear it.