My questions about my married life,we are not...

We would like to inform you that if you mean that you are a resident in Qatar and the separation does not occur officially nor obtaining a divorce certificate in the church or the competent religious authority, you may not be able to marry, especially as a marriage certificate is required once again showing the social status of you if you did not marry or not, so it requires obtaining Certificate of divorce and separation
In addition to that the birth certificate must include the actual date of yours and it must be identical to what is written in the Qatari ID, so you must pay attention to these points about your marriage request.