"Many paths, one mountain"
-Zen quote
I think many Christians will tell you that you must accept Jesus as the saviour and the son of God to be saved. They say this without really looking at what Jesus was saying, though.
Jesus said to him, “I am the way, and the truth, and the life. No one comes to the Father except through me."
“For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life. For God did not send his Son into the world to condemn the world, but in order that the world might be saved through him."
Only a few(144,000) will go to heaven.
Oh yes, he was pretty straightforward about it. It is people who have layered double meanings on top of it. That you must accept him into your heart etc. He was never that vague.
What he actually wants us to do to be saved, through him, is different to what the church is peddling. It's actually much darker. And beautiful.
Muslim god is the same god as the judeo-christian god. so they can and do worship the same god. Of course the vatican created Islam, but thats a whole other thread