Have you ever noticed how God puts things in sequence in the Bible? For example, the Bible says, "Grace and peace be multiplied unto you." It never says "peace and grace"—always "grace and peace." Why? You'll not know peace until you know grace. 

The Bible also says "Believe and be baptized." Not "Be baptized and believe." If you were immersed or sprinkled before you gave your heart to Jesus and truly believed, you haven't been "baptized" at all. True baptism follows true belief. There is another order that God has put in the Bible. Not only grace and peace, not only belief and baptism, but repentance and faith. Always in that order: repentance first, then faith.  If you're having difficulty with faith, try repentance.

There's nothing so damning, so debilitating, as sin in the heart. The writer of Hebrews says, "Take heed lest there be in any of you an evil heart of unbelief."