What is Christianity?

This is a question that I can't quite answer. All I know is I dont think its what alot of people view it to be.
Was having dinner and my housemates were watching Jesus Camp. Obviously I wanted to watch abit of it to see what they had to say. My housemate was saying how horrifying it was.
Through the bit that I watched..I was wondering what kind of Christianity these people had. IS it as horrifying or alien as the secular world thinks it to be? Was I like them? Were my beliefs different from theirs?
Obviously that led me to "what is Christianity"
I had a classmate who asked me if I was religious...Am I? What is the definition of "religious"?
I know I love God. I am not the strongest Christian...but I still love him.
So am I religious? Do i have an opinon on certain topics like homosexuality? drugs? Euthanasia?
I do and some of my reasons are due to my beliefs but does that make me religious? And if I dont have a strong view on topics that the Bible says it should or shouldnt be...does that mean Im not Christian? Or that I don't love Him enough?

I dont even have an answer to why calamities happen if God has control over this world.

But I know I still love Jesus. And didnt Jesus say that those who believe in Him shall not perish but have everlasting life?

Lord, you alone know who I am. You alone know my deepest fears and issues...Show me the asnwers to my questions Lord. Show me what is right or wrong...because I need to know whom I should be following...

God Bless