Tell her about the 33,000,000 Hindu gods and their little helpers that love her to bits...very small bits

I normally ignore those particularly to religion and appreciate those devoid of religion example motivational messages. Something that can make one thinks. When it happens so, they become happy for applauding them on that. Now, they don't send me religious messages anymore but inspirational messages, Love messages etc. I think they have realized it by themselves that my taste for religion is lacking in their perspective.

Respond with things like "Edward Cullens love you" or "Satan preserve you" or "Hulk Bless you."

Or even "Batman watches over thee"

Well...you could always reply with my favorite biblical passage, Ezekiel 23:20. She might even block you after reading that one.

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.

Tell them that you have been converted to pornography, and send them some movies.

Tell them that you have been converted to pornography, and send them some movies.

Family will do the same thing... damn.

Start sending her pornography. She'll either leave you alone or convert.

This worked for me tell them to stop or your block them

Respond with some irritating motivational postings - secular of course

Continue to ignore.

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!

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.

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

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.

If I had a friend who suddenly started texting me with god stuff I'd be worried about their sanity but all you can do is ignore it, it's all meaningless if well intended (I hope) If your friend really cares then cool, if there's a god component to that care I would suggest that you're not leaving anything behind that you need if you put a bit of distance between yourselves.

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

I have a couple friends who do the same. They know I don't believe in sky pixies but they send me that stuff anyway. It might be best to respond by telling them how special they are, then leave it at that.

People like your friend never make to my cell contacts.

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

Not seeing the texts themselves (I am, not asking to see them), I can't really say what her intent might be... other than agreeing with other comments that say she doesn't respect you in the same way that she expects others to respect her.

There was a comedian, I forget who, sho said that behind every "bless your heart" is a little "fuck you!", and I kind of agree with that.

If it were me, and I am glad it isn't, I'd think up snaky replies.
"Jesus loves me?",
Then why doesn't he ever text me himself?
I took out a restraining order, so tell Jesus to leave me alone.
He can't even cut my lawn right.
Funny, he's never even sent me a card on my birthday...

In the end she needs to understand that if she wants you to respect her beliefs, then she needs to respect your non-beliefs.

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

Send her many atheists forwards....

I have had family that have done that to me and I just nipped it in the bud. I've told them if they continue trying to prostilize, convert, or preach to me in any way that I would cut all ties with them. It works like a charm.

I will respect the fact that they believe in unicorns and I won't try to convince them that unicorns don't exist, since I don't know that for a fact. In turn, I don't want them to try and convince me that they do exist. If they don't respect that mutual agreement then I just terminate my association with them.