Making a fake experience certificate

Q: I want to know about doing a course by showing fake experience certificate. I want to do a welding course, but for that you must have 3 years of welding field experience. But I am not in the welding field now. I work in a different field and if I go to a welding related job, then I can't get the salary I am getting now. It will be decreased to the salary of a freshman. Now I have 12000 per month salary, and in the welding job I wil get only 7-8 thousand. Can I show a fake experience certificate to the institute for this course? Will my salary be halaal?

Dream

Q: I did istikhara for a man whom I don't know anything about except his education and work. I spoke to him once and I felt positive vibes inside me. I then did istikhara to get Allah's guidance regarding this matter. I normally don't get vivid dreams and I didn't expect any dream after the istikhara. However, I dreamt that a group of men where  approaching me to attack/harm me. Kindly tell me what this means. Is it positive or negative?

Unknowingly uttering words of kufr

Q: I wanted to know what is the consequences of a Muslim who could have unknowingly left the fold of Islam. I uttered a sentence in the gym that said to an extent that there is other gods but I did not mean it in the context that it was said. I was alone in the gym when this happened. As soon as I mumbled those words and realised what I said, I immediately repented because I did not intend to say it, it just came out of my mouth. I'm extremely worried because what I have learned is that Allah doesn't forgive those who leave the fold of Islam. Please advise me because I love Islam and love Allah and the prophet Muhammad (Sallallahu Alayhi Wasallam).