All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
First of all, we thank and praise Allaah Who guided you to Islam and we ask Him to make you firm and steadfast on His Religion until the Day you meet Him.
We advise you to seek beneficial knowledge, perform good deeds and befriend righteous and pious women, as these are the best things that help a Muslim woman remain steadfast on her religion.
Most of the Sufi sects that exist today are established on disbelief ideologies, innovations and superstitions. If the sect which you mentioned in the question is so, then you are right in asking your husband to divorce you and you are right in separating from him. If he wants to take you back, you should not accept; rather, it is not permissible for you to return to him if he believes in some disbelief ideologies until he repents to Allaah.
For more benefit, please refer to Fataawa 86462, 82017 and 83615.
Therefore, we advise you to marry a righteous husband, and it should be mentioned that it is permissible for a Muslim woman to propose herself to someone whom she wants to marry provided she abides by a good moral conduct and bashfulness when she does so. You may also seek the help of some Muslim sisters in this regard. For more benefit, refer to Fatwa 82471.
Allaah Knows best.