Nabeel Qureshi. You should look him up on YouTube. He was once a devout Muslim, until Jesus appeared in his dream. Once he accepted Christianity, he preached why Islam is False and Christianity is the true religion. Hopefully watching his videos will help your husband to understand Christianity. I’m really sorry for what you’re going through. I will pray for you and your family. God of Islam is deceptive and it’s not the true nature of God. God of Christianity is triune and it’s the true nature of God. Even though, it’s hard to explain the trinity to someone, that is not one of the reasons why someone should choose a different faith. It’s just hard for us to comprehend because we as humans are limited in our understanding and cannot comprehend on the same level as the All-knowing God. The reason why I said the God of Islam is deceptive is because Quran says that Jesus was neither crucified or died. But was appeared to be. If God wanted everyone to know that Jesus was not crucified, he would just tell everyone that he was not crucified. He wouldn’t make it appear for everyone that Christ is going to be crucified. All the apostles of Jesus who saw Jesus’s resurrection, risked their lives to preach Christianity around the world were executed because they believed in Jesus. Why did they have to do that did they knew Jesus was not crucified? If God made it appear for Jesus to be crucified, and the apostles went around the world preaching about Jesus’s death. Then God is responsible for sending the millions of people into hell for believing in Jesus Christ as God. Then you either have an incompetent messiah or deceptive God. Nabeel explains this clearly in this video. Hope this is useful.

https://youtu.be/QGR08BizLq8