Kufr

Q: Idol worshippers believe just as strong as a Muslim believes and also has prayers answered just as Muslims prayers get answered.

Hope you can help with this question as Allah can easily put and end to idol worship yet he keeps sending souls that get programmed into the faith they are born into and by clear observation the majority stay in that faith as they have strong reasons to do so. If a Hindu came to a Muslim and tells him to become Hindu and worship multiple Gods then the Muslim won't do that and vice versa. And just because the Quran says so is not good enough since anyone can put a book and say worship so and so but most will ignore that person and believe what they have been brought up with.

I'm sure you know what I'm saying and would be grateful if you can explain, but please don't explain with verses from the Quran, I want you to explain independently. 

Q: I request clarification related to some words as to whether, Allah forgive, these are kufr. 

1. Saying in any gathering or discussion that " Nauzubillah some people / they (not specifically referred) are saying / believing that where is your Allah and that only science can save the people from any disease / corona virus etc; however our belief is that without almighty Allah nothing can save us". Does words expressed in start leads to kufr for one who quote these words in any discussion or gathering?

2. We sometimes feel that we are so much guilty and have done lots of sin and in fear we say words that " Don't know whether Allah will forgive me or not" though our belief is that Allah is most Merciful and Forgiving. Allah forgive, are these words kufr?

3. We sometimes feel that we have done lot of mistakes and wrong decisions in past though whatever happens is always in our betterment and already written in Taqdeer but we still feel lot of regret, sadness and hopeless and sometimes in that state of sadness and hopelessness someone says words like that" Its all due to his mistakes and wrong decisions related to job choice or other matters consequently he is regretting then then why should he say these mistakes / wrong decisions were due to Naseeb / from Allah". Allah forgive is saying these words Kufur? Nauzubillah intention was not to deny taqdeer.

I am very worried and confused and beg forgiveness and guidance from Almighty Allah. Can you please give some clarification in respects of above said words and other explanation related to kufr and Tajdeed Iman and Tajdeed Nikah?

Q: If someone says “Allah is with me and after Allah, this person or group is with me” is it kufr?

Q: If I uttered a kufr word or shirk word and said the shahadah but did not repeat the mistake again and never sought forgiveness from the sin and were to die upon that state what will happen to me on yawmul qiyamah?