Yes, I would point out that the materials are all standardised but the actual course is just run by volunteers from the loacl church. Obviously, some churches and volunteers are welcoming, open minded, and genuinly want just have a discussion about some of the issues raised by christianity.
Some are nutters and want to convert you at all costs.
really it's luck of the draw. Churches all agree with the basic ideas of the alpha course, but in the discussions, obviosuly, all sorts of questions are brought up, and the answer you get will depend on the theology of the church running the course. The basics are the same (jesus was god, loves you, died for you, rose from the dead...) but the extras (especially around sexual morality, specific sins, the role of women in the church, the way the bible is interpreted etc) will vary from christian to christian and church to church. That's why we chrisians get ourselves in such a tangle - God gives us a lot of margin for error
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Why don't you go and see, and if there are particular bits you find interesting / troublesome, come back here for a wider christian perspective?
I also think t's fair to say that the aim of Alpha is to give people the facts about Christianity and answer their questions, so they become Christians. Christianity is an evangelistic religion - ie, it is part of our faith to tell others about it. That does not mean that you will be pushed into anything, or have it forced on you. But remember for the people running the course, and for most christians, our faith is the central pillar of our lives, and the most beautiful thing in the world. So that is why they want to discuss it with you - because it means so much to the. Hopefully they will follw Jesus' example and do it in a loving and sensitive, non-pushy way, and give you space to make up your own mind.