First can I thank you, tp, for the irenic tone and reasoned nature of your post.
I should say first that the assertion that Jesus lived and was crucified are historical facts; only a tiny number of atheists would be brave enough to batter their heads against those historical facts. The question is whether Jesus was God, and what it would mean to say that He was.
In the past existence of these forums it was against the rules to put the case for atheism, and I am happy to assume the same applies here – it is easy enough to find places where that case is argued.
But I would like to say this:
Many people more admirable than me, more intelligent, more learned, have believed that Jesus was and is God. Many people more admirable than me, more intelligent, more learned, have come to the opposite opinion.
What conclusion do I draw from that? Well, that it is possible for an intelligent person of goodwill to come to either opinion. And if that is so, how can it be true that those who come honestly and with goodwill to one of those two opinions are doing just fine, whereas those who come honestly and with goodwill to the other are thereby committing a sin – a top rank mortal sin, moreover, a sin such that it will certainly afford me an express route to Hell, as one of the posters here suggested?