Do you know why you believe what you believe?
Are your beliefs based on what some person has taught you? If so, do you realize that it may not be all true?
Have you searched the Word out for yourself? Have you allowed the Holy Spirit to be your teacher.
Are you able to explain and show someone else the Gospel?
“Preach the word; be prepared in season and out of season; correct, rebuke and encourage – with great patience and careful instruction. For the time will come when people will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear. They will turn their ears away from the truth and turn aside to myths. But you, keep your head in all situations, endure hardship, do the work of an evangelist, discharge all the duties of your ministry. (2 Timothy 4:2-5, NIV)
Are you able to give an answer for all that you believe?