Am I sinful for not saying "Astaghfirullah (I seek forgiveness from God)" or "Audhu billah (I seek refuge in God)" when I express the intrusive thoughts I've experienced? And am I considered an infidel if I have blasphemous thoughts, such as imagining people as God, even though I feel distressed and try to repel them? And is it permissible for me to delete Quranic verses or Prophetic hadiths from computer files to use other parts of the file, or is that considered mockery?

The questioner is afflicted with waswas (obsessive whisperings), and the cure for this is to ignore the waswas and not pay attention to them. Writing down istighfar (seeking forgiveness) or isti'adha (seeking refuge with Allah) is not obligatory, and there is no sin upon one who omits them intentionally or forgetfully. What comes to mind that is unfitting for Allah the Exalted, and which the questioner repels and dislikes, carries no sin; rather, it is a sign of strong faith. There is no harm in deleting verses and hadiths from files, and this is not considered mockery; it may even be required if the place is unsuitable for them.