Hi James, it's good to have you here, I think you will find many Muslims here who are delighted to be asked about Islam and happy for the opportunity to explain the faith. I have found the moderators to be extremely knowledgeable masha'Allah (masha'Allah is something we say when admiring something about a person).

I was a Christian, but became Muslim about 9 yrs ago. I have found the biggest differences between Islam and Christianity to be 1) the different beliefs about who Jesus was (peace be upon him) and 2) the Christian concept of original sin and the need for atonement through sacrifice, which is unheard of in Islam. In Islam, we believe every person is responsible only for their own sins, and it is only necessary to sincerely ask for forgiveness, and God will forgive. No sacrifice required.

peace to you