What is the sin of one who suffers from excessive flatulence and is asked to stop attending congregational prayers in the mosque because of it? And is it sufficient for him to perform ablution for each prayer after its time has begun?

If the emission of wind is continuous, then the rulings in the fatwas that stipulate a sufficient time for purification (taharah (definition)) and prayer do not apply to you. However, if it stops for a time sufficient for purification and performing the prayer, then you must perform the prayer with a valid purification during this time, even if you miss congregational prayer. This is because purification is an agreed-upon condition for the validity of prayer, while congregational prayer is not a condition for its validity. Performing two prayers together with complete purification is better for one who suffers from سلس (incontinence) than performing each prayer with incomplete purification. There is no sin upon you for missing the congregation due to an excuse, and your love for congregational prayer does not permit you to perform it without purification when purification is possible. Avoiding temptations is achieved by lowering the gaze and staying away from places of temptation. Psychological complexes will disappear if the motive for congregational prayer is seeking the pleasure of Allah. Violating a condition of prayer while being able to fulfill it incurs the wrath of Allah.