My dearest friend from highschool is turning to Islam. These last few years I have been busy and had to change our friendship because I work and now have a family. She called me a few days ago and invited me to her conversion. I admit I know little about islam but it scared me and I don’t know what to tell her. She is married to a catholic man his facebook page shows he is angry at her and is afraid for his kids.

what do I say at this point?
Hi, how is your friend? is she happy, sad or angry?
Are you concerned that she is turning to a religion you dont know much of or concerned that you have heard bad things about Islam?
The Catholic church does not see Islam as a cult but as a religion seeking the same G-d.
If i were lovingly concerned about my friend i would make time to be with her. Consider spending that time in learning with her so you can offer your opinion from what you learn of together.
It may be very hard for you to be unbias but try your best.
As some one pointed out here they see people being brain washed, i was raised with Catholics and can assure you they brain washed me from day one. Even pagans brainwash we all fall to trying to get ever one to believe as we do.
If your Catholic and the Catholic church recognises Islam as a religion seeking the same G-d you should have less concern than if she was becoming atheist.
In my country that maybe a hard line to swallow as our culture is more concerned about Islam than non believers that are pro gay marriage and killing babies. I guess the non believers here are descendants of the Christians but those from Islam are outsiders.
Where i live our Muslim community is very nice and they are caring sharing people who don’t really want to talk about the Quran. Basically they just want to do as their fathers were doing.
It may be wise to ask your friend, do you testify to what you don’t understand? She will likely say no. Ask her if she is being absolutely truthful. After she confirms then ask so,
am i to understand from this you will refuse to make shihada (Islamic profession of faith) until you understand ALL that is in the Quran regardless to how much pressure is put on you by very nice people. Then offer if she is ever going to make it can you be present?
If she very invites you to witness he shihada, open the Quran and ask her the meaning of the letters that open many chapters (surahs). It is said that no one knows their meaning but G-d alone.
On this basis you open the door for the last challenge does she really want to testify what she does not understand to be the truth.
The first part of shihada is just as Yahooshua (pbwh) / Jesus / Isa (pbuh) narrated says in the bible, G-d is One He needs no partner. The second part testify s Mohamed (pbuh) is His messenger.
The first part will be very inviting to a seeking simplistic trinatarian as it is truth spoke simple and can easy excite beyond thinking on the second part.
If after this your friend does make shihada just keep loving her and remember as your Catholic and not just catholic like me you have no real problem as she still worships the same G-d you do.
If you ever embark on reading the Quran know this, it is not as it was “revealed” the order of chapters was modified by a saudi. Dont read the narrations. learn the history of these people the read the Quran again but. Dont read the narrations. Dont read the narrations. then maybe read them.
This i s a lot to do i know but if you love your friend as G-d loves you it will be a very small thing you do. You will have done far more than many Muslims i know many spend more times in hadiths (narrations on the way of Mohamed (pbuh) collected from various sources about 300 years after his death). If you look to the inconstancy, in accuracy and mis translations of the Gospels written some 30 years after the perceived death of Yahooshua (pbwh) you can begin to imagine how suited hadiths maybe to the desire of their source. If you look into the history over those 300 years things become even clearer.
Oh lastly IME Muslims will be very happy to be with your friend without her making shihada provided she does not associate partners to G-d, some will even be patient with this.
Allah is with the patient so if Allah is rightly guiding those around your friend thay will be happy to let her take as long as she likes to make shihada as they respect ALL of the prophets (pbut) and their followers.
I am not real good with writting feel free to PM if you ever need as i dont come much to CAF as i was suspended for speaking on Islam and after PMing two moderators Eric and Racheal never was given a response. I guess even Christians dont love at times.
Your care for you friend is truly of G-d / Allah and is the way of Yahooshua (pbwh) Our King and Brother showing our G-d who relates to us as would a true Father.
Blessings to you and yours, pray well and stay well