True. You are Jewish, and you are still Jewish ... and you still have ONE G-d!
We know The Trinity consists of The Holy Spirit, G-d The Father, and Yeshua. Well, The Holy Spirit (or known as Holy Ghost) is mentioned specifically three times in the Hebrew Tanakh (Psalms 51:11; Isaiah 63:10-11), and He is referred to as "The Spirit of The L-rd" several dozen times throughout The Torah and Tanakh.
So, here is how my logic goes. If a Jewish person says, "I can only have one G-d." Well, I hate to tell you - but you already have 2 out of the 3.
With that many references to The Holy Spirit and the "Spirit of The L-rd" - then how do you explain having 2 G-ds?
This is where we have to look at the Hebrew word "one" much more closely. When we recite the Shema from
Deuteronomy 6:4, "Hear, O Israel! The L-rd is our G-d, The L- rd is one [Echad]!" The one in that sentence is referring to a oneness in unity (Echad), not a oneness in absolute total or number (Yachid). The Hebrew word "Yachid" would be used to refer to a oneness in number (like if you were counting); and is NEVER used as a reference to G-d!
Here is how I can best explain this - using sports. Sports seem to make sense to people. If you like the New York Yankees - how many players are on the team? Counting the full roster, there are 40 players, plus the coaches, and when on the field there are 9 players out there at a time. That's a lot of people to make up ONE team!
You see, the New York Yankees as a team would be referred to as "ECHAD" - a plural form of "one" that makes up a unity. Whereas, each individual player, would be referred to as "YACHID" - as one person in the total number.
For example, how many first basemen are out on the field at one time?
Of course, just ONE (YACHID).
With ECHAD, all of the parts (or players) make up the whole team as a single unit. Furthermore, each player on that team performs a unique role that allows the team to function collectively as a unit.
Same with The Trinity - each part of The Trinity performs a specific role.