What would be the purpose of having sacrifices during the millennial reign when Christ has already provided the sacrifice?

Please explain the trinity of GOD, the Father, Son and Holy Spirit.

Is Jesus introducing the Jews to the future kingdom of heaven on earth? And if that's the case, are the acts indicated in Matthew 5:29-30 the result of Matthew 5:28 and something believer's must physically carry out while in the future kingdom in order to enter into his final resting place?

I believe in eternal security but someone recently showed me a couple of passages from 2 Peter that were difficult.

Can you tell me what the flower that is "the lily of the valley" symbolically referred to Christ? I would like to know if this is the same 'lily' promoted as the 'Easter lily'. After examining some of the roots of the holiday called "Easter", it is easy to see that most of this 'holiday' has nothing to do with the Resurrection of Christ.

Did the Trinity as we know it, God the Father, God the Son (also known as the Word), and God the Holy Ghost exist before creation? In other words, was Jesus known as Jesus prior to his being born as a man?

I've been having a heated discussion with a fellow church member about the differences between James and Paul. How James was under a different dispensation than Paul, my friend can't buy that. I was wondering what scriptures I could show him that would back up my argument? I tried to explain how James was a legalist, that his teaching was faith plus works for salvation, and Paul's teaching is Faith. Can you help?

Does the God of the Bible leave some sick while healing others?

Benny Hinn, John Hagee, Rod Parsley and many others from TBN practice healing and speaking in tongues along with other things. Is this scriptural?

Why do Christians say God is self-existent, eternal, spirit and trinitarian? What scriptures support this claim?