Something to think about.
Are You Ready
15 but in your hearts honor Christ the Lord as holy, always being prepared to make a defense to anyone who asks you for a reason for the hope that is in you; yet do it with gentleness and respect, 1 Peter 3:15 (ESV)
Your preparation is your testimony. Because He saved, me, healed me, loved me, that is the reason for your hope, whatever it is that turned your heart toward Him. Forget theology, forget scripture, forget intellect, only tell them what Jesus did for you.