She doesn't respect you....and respect among friends should be always present.

When you end an email, tell her that Satan loves her. When she complains tell her that you will stop when she does.

She obviously doesn’t respect you. Is that a real friend? Tell her, don’t ask her, to knock it off. If she doesn’t, say goodbye.

Make an appointment to meet her and turn up with a colander on your head and a faraway look in your eye. Waffle on about the Flying Spaghetti Monster and how His touching you with his noodly appendage has changed your life. Offer to take her to meet the local FSM group and have spaghetti etc. etc.
See how she likes it.
Alternatively, tell her to fuck off!

Tell her what you just told us. Tell her to stop messaging you Jesus crap. You do not share your Atheist crap with her so she should stop sending Jesus texts to you.

It's harassment. But the good news is the bible gives you plenty of material to throw right back.

Just make the following quote:

“Those who know do not speak. Those who speak do not know.”-Lao Tzu

Next time she says it you could reply with "I couldn't care less" if there's one thing that annoys theists it's apathy.

If nothing else, I’d gradually put more and more distance between the friend and me.

You not wrong, it is manipulative. Even people who do this to everyone they talk to, are being manipulative.

If you have asked her not to do that then It is a form of mild abuse. Trying to guilt you into questioning your non belief. It is at the very least annoying and disrespectful.
I had a couple friends continue to try to talk Jesus to me after I came out as atheist. I told them I like them and would like to continue being friends and talking with them but they would need to stop with the Jesus tal and the guilting because it was not going to work, that it has the opposite effect on me. They got the message and we still talk so that is what worked for me.

Call her out. Say something like....

You - "Do I treat you with respect?"

Her - "Yes. Always why?"

You - "I feel disrespected when you give me of your faith, especially when you know I'm an atheist"

Her - "I'm sorry. I never thought of that"

You - "That's OK. Please respect my atheism the way I respect your faith".

This might not work thought

She's trying to "save" you. She's pretty much telling you that you are lost and misguided and destined to burn in hell...........unless she can show you the error of your ways.

It will continue until you take actions to discourage it. If it offends you (it would me), say so. It can be done politely... or NOT. Whatever it takes.

I had an auto body shop guy who is a leader of some yahoo sect. Once he fixed my car, and when I got it back, there were fliers everywhere. In the console, under the seats, between the seats, under the floor mats... I pulled down my visor and got a flier shower. I just laughed, and then burned them. People expect you to respect their beliefs, but they need to respect yours too. If they don't, they're probably not worth it.

find new friends.

Yes she is being manipulative. I would end my texts with something cryptic like "Freud forgives you" just to confuse her (but that's my sense of humour ?)

Hmmm this sounds like this could be a tough one , your friend sounds lime the type that breathes,drinks,and eats her religion, in other words just can't stop mentioning it!, one thing you can Is to ask or say look im well aware your religious but honestly it isnt necessary to say Jesus loves me in your texts to me, i mean its like your deliberately doing it to annoy or put me down. Just try and say it in a way where it isnt offensive and it turns into a mountain

She's no friend. Friends accept you as you are, and don't try to manipulate you into agreeing with them. She doesn't respect you, or your beliefs. She thinks she's better than you because she believes and you don't.
If it were me, I'd cut her off with no remorse.

People like your friend never make to my cell contacts.

Have you asked her nicely but firmly to stop including religious things in her texts to you? If not, I would let her know that you’d like her to refrain from any religious talk because you’re not interested in hearing about it

Family will do the same thing... damn.

I would feel sorry for anyone who could not relate to me (a non-believer) without mentioning Jesus. She needs to get a life that matters.

Respond with some irritating motivational postings - secular of course

I have friends that do this, as well. I usually respond by adding a Bible verse containing some atrocity committed by Yahweh or one of his followers, such as Elisha and the she-bears, or Abraham pimping out his wife to Pharaoh. The Bible is full of stories showing what an asshole the main character can be.