What does scripture and Jesus say about marriage/who can marry? Is marriage between a man and women only or can LGBTQ persons legally marry?
As you are probably aware, the issue of same-sex marriage is a controversial and potentially divisive issue in the church. My personal belief is that the Bible is silent regarding who can and cannot marry. The only time I can recall Jesus speaking about marriage is in Mt 22:30, but his comments are in response to Pharisees who are trying to trap Jesus, and are really more about resurrection than marriage. As is often the case, the context of what Jesus is saying is important.
The second part of your question asks if LGBTQ persons can legally marry. In the United States, the answer to that question is determined by individual states, and within Illinois, same-sex marriage is legal. However, I think you mean to ask what the Bible sanctions. Different people answer that question differently – and very passionately. I am providing links below that present opposing views, and you can find people with each of these views within the membership of the Christian Church (Disciples of Christ).