If you are concerned that you cannot defend the foundational truths of the Scriptures, namely, the bodily resurrection of Christ, the visible return of Christ, the deity of Christ and the existence of a literal Heaven and a literal Hell, then stick to the elementary principles of the Gospel, and share your testimony of what Jesus means to you. If you cannot do even that, what worse harm could the Jehovah’s Witness do to you, that you haven’t already done to yourself?
God’s people perish, not for a lack of food and water, but for a lack of every word that proceeds out of the mouth of the Lord:
Deuteronomy 8:3: “He humbled you and let you be hungry, and fed you with manna which you did not know, nor did your fathers know, that He might make you understand that man does not live by bread alone, but man lives by everything that proceeds out of the mouth of the LORD.”
Hosea 4:6: “My people are destroyed for lack of knowledge. Because you have rejected knowledge, I also will reject you from being My priest. Since you have forgotten the law of your God, I also will forget your children.”