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. We ask Allaah to exalt his mention as well as that of his family and all his companions.
The prayer is the greatest pillar of Islam after the two testimonies of faith; whoever abandons it while denying its obligation is a non-Muslim according to the consensus of the scholars. Nonetheless, if one abandons the prayer out of laziness, then the scholars differed in opinion in his regard. Anyway, there is no good for a Muslim woman to stay with a husband who does not perform the prayer, in this regard please refer to Fatwa 87572.
Therefore, we advise you to invoke Allaah earnestly to guide him and enable him to perform the payer. You should advise him in a nice and soft manner and warn him about the evil fate of persisting in abandoning the prayer. Some scholars, knowledgeable people or any other pious people like those who are running the said Islamic centre should take the initiative to advise him. Then is he persists in his misguidance, ask him to divorce you. If he refuses to divorce you, take the matter to the Islamic centre again so that they would remove the harm off you by divorcing you from him or obtaining Khul' (divorce in return for compensation).
Finally, the two following matters should be mentioned:
1- A person may become a Muslim and be steadfast on Islam afterwards even if he initially did so just to marry a particular woman, and there is nothing wrong with this. Indeed this is what happened to Abu Talhah with Um Sulaym ; in this regard please refer to Fatwa 83685.
2- Some people may pretend to embrace Islam without really following its obligations and rules just in order to achieve a particular benefit like marriage; in this case one should be wise and witty and not hasten to accept to marry such people so that one will not regret it later.
Allaah Knows best.