What should I do? Is there anyway I can help my husband convert? or should I just accept my mistake, bear my cross, give up and accept that there will never be real unity in our home?
I just re-read your original post. Obviously, first of all, nothing is impossible with God ... so you never give up. That's the lesson of St Monica, perseverance and hope.
Secondly, you should never imply that your spouse is a mistake. Even if you did not use sound Catholic judgment in all your decision-making, God allows even these judgments for a reason, and you're with the person He willed you to be with. It's like people refer to children born out of wedlock as "mistakes", but no child is a mistake (even if the decisions leading up to them weren't the best); God willed the creation of these children. If your husband was a mistake, then your children are mistakes, right? But that has never been the case. Water under the bridge now of course.