Of course one cannot go to heaven without God. The question is how does one make God want to be your savior.
It is my opinion that you can't make G-d do anything at all. He doesn't need you. You will add nothing to Heaven that He can not provide without you. If it weren't for His love for you, you would have started lost and remained lost.
Are you aware of what the Rabbis say about why G-d chose Israel?
Shalom.