There are many different kinds of doubt. When we doubt the future, we call it worry. When doubt other people we call is suspicion. When we doubt ourselves we call it inferiority. When we doubt God we call it unbelief. When we doubt what we hear on television we call it intelligence! When we doubt everything we call it cynicism or skepticism.
I developed a long time ago some habits. One of them is what I call "divert daily, withdraw weekly, and abandon annually." Divert daily is everyday you do something that's not work-related. You do something that relaxes you. Then you withdraw weekly. The Bible says every seven days you take a day off. And then abandon annually means you just go out and forget it all.
I am motivated by the fact that in the next 365 days, 136,000 Californians will die and most of them will go into an eternity without Christ. In the next 365 days, 2.4 million Americans will die; most of them will go into eternity without Christ. In the next 365 days, 74 million people in the world will go into eternity without Christ and without hope. I can't live with that.
You can keep your own religion - Buddhism, Islam, Hinduism, Mormonism - you just need to add Jesus to the equation. Then you become complete. You become a Buddhist with Jesus, a Hindu with Jesus, a Muslim with Jesus and so on. You can throw out the term Christianity and still be a follower of Jesus. In fact, you can throw out the term Christian too. In some countries, you could be persecuted for calling yourself a Christian, and there is no need for that. Just ask Jesus into your heart, you don't have to identify yourself as a Christian.