Challenged by a misunderstood gang member who has become a bad influence at their school, a high school freshman pastor strives to remind him the importance of giving the lord a chance with the risk of being a target of the gang member.

+1 RichieV.
This logline is quickly shaping up.

Just trying another take:

A high school pastor risks his own safety as he strives to imbue the Lord's word on a misunderstood gang member who's rising influence spreads through the school.

You also might not need "at their school," since you mention the antagonist is a high school pastor we will assume his bad influence is at the school.

Slightly shorter version without changing what your wrote too much.

"Challenged by a misunderstood gang member who has become a bad influence, a high school pastor strives to remind him the importance of giving the lord a chance with the risk of becoming his target."

Now everything is there.

If at some point, if you decide to shorten it. I would end with, "with the risk of becoming 'his' target." and get rid of the end "Of the gang member" (That also eliminates using the word gang twice)

I am not sure "freshman" is needed unless it is important to the story.

But overall this is the best version you have done, Good job, I like it.