[The answer is critical for me and really I need help]
For years I almost had Mumin/Believer's signs cited in Quran. But after a while I found out that this makes life for me hard and, for others easy. I had to decide if I can do X or Y. I have to had stress to keep God satisfied. I had to force myself to worship and to avoid sins. I had to keep in my mind that I'm Muslim for the whole of the day and night. I had to force myself to do what my mind did not understand. Specially I always had to be careful about prayer times to not miss a prayer!
Nowadays, I know more about liberal and secular societies and people. They're free. They have not to think if something is a sin or not. They can do what they think is right and the law will protect them. As a result they're more happy than we are because they feel the free. They have not to think if they can have this music or how they should pray in Alaska or Norway when the length of the day time is abnormally long. They can try things and learn.
I know there are problems with them too. But I mean on average. On average they are better than us in Science, Technology, Societies, Successfulness and even Morality! They're more serious to doing their job well than us, on average.
My question is, when a non-Muslim who does not accept Islam, can be good, successful and a university scientist, why should I force myself to be a Muslim? I know the Quran's provided advantages and punishments but all of them are after death. A death after a hard life. What's the problem with non-Muslim guys in Liberal or Secular societies who are good and respectful that I should force myself to be a Muslim? and so, with what motivation should I be a Muslim and keep this until my death?!!