Maybe God is communicating in other ways, as well, anna and you simply do not see them. Have you ever considered that possibility? That God is speaking to you, but that you just aren't listening?
As for why faith is necessary at all, allow me to demonstrate; when you love someone, and they love you, you trust and believe them when they say and do things to that affect. When things between you and a lover or loved one are tough and that person says "It's going to be okay", the ultimate show of your love for them is faith in what they have just said. If you truly believe them when they say "It's going to be okay", they don't need to give you proof; it is enough that they love you and that they mean it when they say it.
That is faith, and why it is necessary, especially between humanity and a being like God.
As for why faith is necessary at all, allow me to demonstrate; when you love someone, and they love you, you trust and believe them when they say and do things to that affect. When things between you and a lover or loved one are tough and that person says "It's going to be okay", the ultimate show of your love for them is faith in what they have just said. If you truly believe them when they say "It's going to be okay", they don't need to give you proof; it is enough that they love you and that they mean it when they say it.
That is faith, and why it is necessary, especially between humanity and a being like God.