As a Christian, the enemy will come against us, we need to be prepared.  It is not enough to just have faith.  You need a good conscience, too.  Paul told Timothy, “wage the good warfare,  having faith and a good conscience, which some having rejected, concerning the faith have suffered shipwreck” 1 Timothy 1:18-19 

We are to live by faith, and if you have faith, Jesus said that nothing will be impossible for you.    In addition to faith, we need to feel not condemned/guilty; we need to trust in God.   Remember, Jesus took all guilt on the cross so we would be justified.