Is there only one God?

The one true and living God (Jer 10:10, 1 Thes 1:9) chose to reveal Himself through the Jewish people, and the God of Israel plainly says, "...there is no God apart from me, a righteous God and a Savior; there is none but me (Is 45:21)." This fact is repeated outright in the Bible over and over, here are a few examples: Is 43:10, Deut 4:35, 1 Kings 8:6, 2 Kings 5:15, Joel 2:27, 1 Cor 8:4-6, Eph 4:6.

There is only one way to access God and that is through Jesus Christ.

"There is one God, and one mediator between God and man, Jesus Christ.(1 tim 2:5)

Jesus left no room for discussion when He declared His sovereigness as the only way:

"I am the way, and the truth, and the life, no man comes to the Father except through me" (John 14:6).

The Bible impirically demands this of the name of Jesus Christ:

There is salvation in no one else. For there is no other name under heaven, given to mankind, by which we must be saved." (Acts 4:12)

The Bible teaches that God is a three part being - Father, Son and Holy Spirit (Matt 28:19), three distinct parts with distinct functions as one whole being. This shouldn't seem strange since everything that we know of in existence is the sum of individual parts. Even humans were created as a three part being in God's image (Gen 1:27), consisting of body, soul and spirit (1 Thes 5:23). And even though humans must allow God to bring their fallen nature back into alignment with his holy character (Matt 5:48), neither humans nor angels can be gods. Neither God, nor any part of God, ascended to His current state - He simply is and always has been...God...and, He has not, and will not change (Heb 13:8, Mal 3:6) because He is perfect.