So there's your problem. Focus on Jesus and His written word and don't debate those that don't believe. This is what's happening to you:
Proverbs 23:9 (KJV)
Speak not in the ears of a fool: for he will despise the wisdom of thy words.
Proverbs 9:8 (KJV)
Reprove not a scorner, lest he hate thee: rebuke a wise man, and he will love thee.
Matthew 7:6 (KJV)
Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.
Keep your eyes on Jesus, grow in Him and His word. When you're through training, then God can use you for the battle field. You're not prepared to deal with them. Besides, you're throwing pearls before swine those that do not want to hear.