The bible proves that god exists argument

[Sponger15SB]

I'm trying to argue with someone who keeps quoting bible verses to claim that god exists and that we should believe in him.

For example, from John 15:1 "I am the vine, you are the branches. He who abides in Me, and I in him, bears much fruit; for without Me you can do nothing."

Now, can someone give me some ammo, especially dealing with what logical fallacy this is, etc.

I am having a hard time recalling what I learned in Philosophy 101.