It is wonderful that God is calling you back to Him, and that He is challenging you to seek the Truth. That is what all of us are seeking, and when we find it, we are filled with joy.
Right now it sounds like you are looking at the fundamental beliefs of your faith and comparing them with what you learned as a child. That’s what you should be doing. Our faith is only OUR faith if we own it, not simply inherit it.
Maybe a starting point is to write down what you believe and why. Your “why” should be based on Scripture and the teachings of the early church fathers (what we Catholics call Tradition). You say that you don’t think those outside of the Church of Christ are not saved. What do you believe about salvation and why?
Another thing you might do is to look around at people whose faith you admire. Learn how they developed their faith. I know many faith-filled people, and not all of them are in the Catholic Church. But they are all inspirations to me as I grow in my faith.
I am Catholic because I believe what the Church teaches. I believe in the Real Presence in the Eucharist (what a GREAT gift!). I believe that our church fathers began the teaching that is continued today in the Magesterium, and that they know what they are talking about. I also believe that I am responsible for understanding the teachings of the Church so that I can explain it to others and so that I can better follow our Lord.
I encourage you to spend time in prayer each day asking God to enlighten you about where you should be worshiping. Be patient, especially when you don’t think you’re hearing an answer.
You mentioned your family, which is often why people turn back to God. It can be tempting to choose a church that is easiest for your family to accept, but that’s not what we are called to do. We are to choose what we know to be the Truth. For example, many churches have lots of things to keep kids entertained. That may make it easier to get the kids to attend church without a hassle, but it shouldn’t be driving our decision.
You can begin to attend a church without becoming a member. That may be a good start as you explore the different doctrines and creeds of a particular denomination. It also gets your kids into the habit of going to church.
I’ll pray for you as you move forward. Praise God for calling you back!