Hello unbaptised.
I will start at the common ground you and I share. We do believe in the infallibility of the Bible. So I will answer your question using the Bible as the authority on the subject.
The God you have known, the God of the Watchtower as Jehovah is only a pale veiled version of the YHWH of Scripture. In Hebrew name=nature. God's name is His nature. He has many aspects to His nature, thus He has many names;
ELOHIM is the first name for God found in the Bible, and it's used throughout the Old Testament over 2,300 times. Elohim comes from the Hebrew root meaning "strength" or "power", and has the unusual characteristic of being plural in form. In Genesis 1:1, we read, "In the beginning Elohim created the heaven and the earth."
Elohim is combined with other words to describe certain characteristics of God; Some examples: Elohay Kedem - God of the Beginning: (Deuteronomy 33:27). Elohay Mishpat - God Of Justice: (Isaiah 30:18). Elohay Selichot - God Of Forgiveness: (Nehemiah 9:17). Elohay Marom - God Of Heights: (Micah 6:6). Elohay Mikarov - God Who Is Near: (Jeremiah 23:23). Elohay Mauzi - God Of My Strength: (Psalm 43:2). Elohay Tehilati - God Of My Praise: (Psalm 109:1). Elohay Yishi - God Of My Salvation: (Psalm 18:47, 25:5). Elohim Kedoshim - Holy God: (Leviticus 19:2, Joshua 24:19). Elohim Chaiyim - Living God: (Jeremiah 10:10). Elohay Elohim - God Of Gods: (Deuteronomy 10:17).
"EL" is another name used for God in the Bible, showing up about 200 times in the Old Testament. El is the simple form arising from Elohim, and is combined with other words for descriptive emphasis of God's nature.
El HaNe'eman - The Faithful God: (Deuteronomy 7:9). El HaGadol - The Great God: (Deuteronomy 10:17). El HaKadosh - The Holy God: (Isaiah 5:16). El Yisrael - The God Of Israel: (Psalm 68:35). El HaShamayim - The God Of The Heavens: (Psalm 136:26). El De'ot - The God Of Knowledge: (1 Samuel 2:3). El Emet - The God Of Truth: (Psalm 31:6). El Yeshuati - The God Of My Salvation: (Isaiah 12:2). El Elyon - The Most High God: (Genesis 14:18). Immanu El - God Is With Us: (Isaiah 7:14). El Olam - The God Of Eternity (Genesis 21:33). El Echad - The One God: (Malachi 2:10). "ELAH" is another name for God, used about 70 times in the Old Testament. Again, when combined with other words, we see different attributes of God. Some examples: Elah Yerush'lem - God of Jerusalem: (Ezra 7:19). Elah Yisrael - God of Israel: (Ezra 5:1). Elah Sh'maya - God of Heaven: (Ezra 7:23). Elah Sh'maya V'Arah - God of Heaven and Earth: (Ezra 5:11).
YHVH declares God's absolute being - the source of everything, without beginning and without end. "I Am Who I Am" Here are some examples of YHVH used in scripture: YHVH Elohim - LORD God: (Genesis 2:4). YHVH M'kadesh - The LORD Who Makes Holy: (Ezekiel 37:28). YHVH Yireh - The LORD Who Sees/provides: (Genesis 22:14). YHVH Nissi - The LORD My Banner: (Exodus 17:15). YHVH Shalom - The LORD Of Peace: (Judges 6:24). YHVH Tzidkaynu - The LORD Our Righteousness: (Jeremiah 33:16). YHVH O'saynu - The LORD our Maker: (Psalm 95:6).
Jesus shares the same attributes as YHVH and clearly claims to be YHVH. In John 8:56-9, Jesus presents himself as the "I AM."
Those Jewish leaders understood that Jesus was claiming to be YHVH and tried to kill him for it.
soooooooo...according to the Bible the WT has recreated the authentic YHWH and Yeshua. Jehovah is the true God, however there is so much more to Him that the WT has ever taught or believed. He does not need an organization of self righteous men to rule His sheep because He is. His son is not a recycled angel either but the great YHWH manifested as Yeshua.