This is a slight religious question, but is it normal for me to think that if I become religious (to be specific christian) my whole life will fall apart and all my loved ones will be hurt and all that horrid stuff. Because it just seems that way, especially since they say God is a jealous God.

They're taking the bible quote out of context:
Exodus 34:14 For thou shalt worship no other god: for the LORD, whose name is Jealous, is a jealous God:
I would suggest talking to a minister for guidance, especially when dealing with a resistant family