Evil thoughts especially when they are not within a person's control are not considered sins. The best way to rid yourself of these thoughts is to absolutely ignore them. They will become less and less until they fade away completely. They are not really what you think but something that just crosses your mind and they should be treated as such. If it has reached the stage when you cannot help making yourself think these things then again the best remedy is not to punish yourself at all, but to completely ignore them as if they did not even occur. Over time it will pass.
May you always be successful
It is because of different ahadith.
The position of the hand in prayer may not be very important, but a scholar must determine who he should refer to after the demise of Prophet to receive the his Sunnah, and he should know that who is his Ulolamr. Should he refer to the Ahl al-Bayt or he can refer to the companions of the Prophet, even though some of them, they don't know deeply about Islam?
The followers of Ahlulbeit are called Shia and the followers of companions are called Sonni.
1, Folding arms while praying was never practiced nor permitted by the Prophet Muhammad (SAWA). It was started by Omar Ibn al-Khattab when he saw the Zoroastrian prisoners of war who were brought from Persia to Madina folding their arms as a sign of respect. He ordered people to do that during Salah. Leading Sunni scholars like Ibn Rushd in Bidayat al-Mujtahid page 323 admitted that there is no evidence at all that the Prophet (SAWA) ever folded his hands or arms during praying.
Sunni well know scholar Malik ibn Anas who is the founder of Maliki Sunni sect refused this practice of folding hands while praying.
'Many well known Sahaba (Companions) refused folding hands like Ibn Abbas, Ibn Mas'ood, and above all and most importantly Imam Ali (AS) who was ordering Muslims to do this practice which is from non Muslims.
2.Sajdagah: We follow the real Sunnah of the Prophet Muhammad (SAWA) who never prostrated during prayers on carpet or textile and used to put his forehead on the earth. He said: The earth was made for me as place for prostration and purification. جُعِلت لى الأرض مسجدا وطهورا
That is why we put Sajdagah to put our forehead on the clay of the earth like the practice of the Prophet (SAWA).
as salam alaikum
the opinion of the Ahl al-Bayt and the ijma' of their scholars is that sadl (praying without hands folded) should be performed while standing during salat.
Imami sources establish it through several ahadith on the authority of the Imams of the Ahl al-Bayt like when Imam al-Sadiq describes the modality of salat to Hammad Ibn 'Isa (see "Man la yahduruhu al-Faqih" by Shaykh Saduq, vol. 1, p. 196).
In Zaydi sources there is a hadith on the authority of the Messenger of Allah, peace be upon him and his family, in the "Manahi" of Ibn Mansur where he stops a man while praying with folded hands saying that this is the way of the prayer of Ahl al-Kitab.
In Sunni sources many scholars of the Malikiyyah and some of the Shafi'iyyah brought forth a sahih hadith from Sunan al-Nisa'i as evidence.
Ibadi sources report an hadith on the authority of the Prophet in this regard (see "al-Idah" by 'Amir Ibn 'Ali al-Shamakhi).
As far as the Qur'an, some scholars have quoted the verse "The believers are successful! Those who have khusu' in their prayers" (23:1-2) and said that praying with folded hands would invalidate the khusu' during salat. Wa Allahu A'lam.
With prayers for your success.
The habit of folding ( crossing)
hands during Salaah came from non-Muslims (notably Zoroastrians) and wasn’t part of the Salaah of the Holy Prophet (sawa), nor during the government of Abu Baker. However, during the rule of Umer ibn Khattab, when Persia was concurred by Muslims, several prisoners of war were brought from Persia to Madina. They folded their hands in front of Umer, who asked them why they did so. They responded that it was their habit in front of respected people. Umer liked it and decided to keep it in the prayer. Ali ibn Abi Talib (a.s) and many of the Sahaba refused this, because no one has the right to change or add or to omit anything from the Salaah, and the Prophet (sawa) had famously said, “Pray as you saw me praying.
Therefore Amir ul Mo’mineen (a.s), his followers (Ammar ibn Yasir, Salman al Farsi, Abu Dhar al Ghifari) and all of his other pious companions continued opening their hands while praying, exactly like the Prophet (s) used to.
In the Sunni school of thought, none of the four leading jurists (Abu Hanifa, Shafi’i, Malik ibn Anas, Ahmad ibn Hanbal) ever said that it was obligatory to fold hands during Salaah, because there was no evidence to support it. Imam Malik even said it was not good to fold hands, and all Malikis thus open their hands in Salaah. A famous Sunni ‘Aalim from Egypt, Sayyid Sabiq, wrote in his book Fiqh as Sunnah: “we do not have even a single authentic Hadith that the Prophet (s) ever folded his hands in the Salaah.
Numerous famous individuals from the Sunni school of thought such as Abdullah ibn Zubayr and Laith bin Saad didn’t fold their hands either. Folding hands in Salaah was therefore not part of Islam, it was brought to Muslims from non Muslims by Umer ibn Khattab.