Is a person held accountable for a heart inclination towards a disbeliever, or for rejoicing at seeing them? And is a heart inclination towards innovators or Christians considered apostasy, especially if it stems from not knowing their disbelief?

The effect of 'waswasah' (whispering of Satan) is evident in the questioner, and she should not exaggerate it. A mere inclination of the heart is not considered love, and the ruling on attachment varies depending on what it is attached to. Ignorance of the disbelief of Christians and the like does not necessitate disbelief for its possessor due to doubt and the absence of established proof. As for innovators, their specific individuals should not be declared disbelievers generally; rather, the mainstream imams of Ahl al-Sunnah hold that there should be a detailed approach depending on the person, their situation, and the type of their innovation.