“If God is only here for us, then why would he get jealous?”
Because this is a personification of something that cannot quite be personified. God is anthropomorphized (meaning, made to appear human-like) as a way that we humans, created in HIs image, can connect with God’s revelations to humanity.
As for God being “jealous”, this is often conflated with God being “envious” — yet that is a separate word with a separate definition. For those of us who believe in God and Christ as our Savior, we understand that God is the source of love, that He is *love*. And because of this — and just like a love in a truly committed relationship or marriage — we agree to be *faithful* to the commitment. Or at least that is how relationships are supposed to work.
Therefore, when it mentions in the Bible that God is “jealous”, it is actually that, as our source of love, He protects the purity of the relationship. This is especially important now in our age of subjective truth and moral relativism.
Further, this topic reinforces the problem with the many skeptics who take a purely literal approach to reading and understanding the Bible. Namely, it contains several genres — in 73 *separate* books compiled into one.
And correctly understanding the Bible involves using four key interpretations: Literal, Allegorical, Moral, and Anagogical. A large swath of passages in the Bible incorporate all four interpretations.
If you read the Bible as Christ being the core of the Bible’s message — and that a bulk of the Old Testament points to Christ — the context becomes much clearer, even if you still choose not to believe it.
Lastly, God isn’t here “only for us”. He is here to guide His family. Just as a great father guides his, yet the father has much more than just one purpose.