Jesus is Lord. The Holy Spirit is Lord. The Father is Lord. I grant you the trinity is a difficult concept, however, the Lord is infinite and we are finite so any description we can give will be wanting. It is strange that one can see (seemingly) contradictory properties in Nature (his creation) and we accept it yet many balk at accepting the triune nature of God.
Human beings seem to want to simplify God by making his omnipotence a singularity...Humans seem to want God to be distant master.
Our limitations in understanding the nature of God is why, I believe, why God emptied himself and became flesh. Jesus said he was God. As CS Lewis argued... he was either Lord, liar or lunatic he was not merely a good teacher or prophet. The Holy Spirit I know exists because since I became a believer he has dwelt within me.
God wants a personal relationship with each of us...he is our Father not some distant, omnipotent master. In a sense... I don't think Christianity is really a religion.... it is a relationship. Much of the ministry of Jesus was contending with religious leaders (Sanhedrin) who were legalistic and were so caught up in the rabbinical traditions that they lost sight of, and perverted, the real meaning of the scripture. I feel that so many spiritual people are so utterly lost because they believe in the structure and rituals of religion rather than having an intimate personal relationship with our Lord through Jesus Christ.